Cthulhu: the End of the World Is Coming and I Will Become the Fourth Natural Disaster

Ren·Taiyi Zhengyin (The Primordial Unity) Godhead: The network of empathy in the universe and the source of connection between all things. He is not an individual, but a fundamental field that pervades all consciousness and existence. He promotes altruism, cooperation and love in civilization, and is the first reason why life transcends selfish algorithms and moves toward community. High-dimensional form: manifested as the background "white noise" of telepathy in all civilizations, or a golden light network that connects countless worlds like neurons.

Rites · The Weaver of Codes The Godhead: the architect of the structure of the universe and the form of civilized society. From the spirals of galaxies and the orbits of atoms to the language, laws and rituals of civilization, all "patterns" and "norms" contain His code. He prevents existence from slipping into pure chaos. High-dimensional form: an existence that is constantly weaving multi-dimensional threads. The threads are physical laws, social contracts, and cultural genes, which together weave the texture of reality.

The Arbiter, Celestial Balance Godhead: The embodiment of cause and effect and distributive justice in the universe. He ensures that the flow of energy, resources, and opportunities is consistent with some profound "fitness." Civilizations prosper due to diligence and justice, and face adjustments due to plunder and injustice, all of which are manifestations of His laws. Higher Dimensional Form: A giant statue holding an invisible scale. Its eyes can see the causes and consequences of all actions at the same time. One end of the scale is order and the other end is chaos.

Wisdom · The Omniscient Discerner (The Omniscient Discerner) The Godhead: the lighthouse and filter in the sea of ​​information in the universe. He is pure understanding and insight itself, helping civilization distinguish truth from illusion, wisdom from knowledge. Every critical "enlightenment" and "scientific revolution" of civilization may be touching His projection. High-dimensional form: a sphere composed of countless rotating crystal prisms. Each side reflects the truth of different dimensions of the universe, and can refract and disperse falsehoods and fallacies.

Rage·The Consuming Tide Godhead: Pure, indiscriminate urge to destroy. It is the heat death tendency of the universe roaring at the level of consciousness. He does not represent righteous anger, but the violent energy that decomposes all things after logic and communication are completely broken. Higher Dimensional Form: A scarlet storm composed of hot plasma and shattering laws that sweeps across multi-dimensional space, leaving only a uniform soup of elementary particles in its path.

Laziness·The Stagnant Abyss Godhead: The ultimate victory of entropy is the embodiment of heat death. Not rest, but the complete end of all desire to move, think, and evolve. He makes the stars go out in advance, makes civilization stop questioning in contentment, and finally returns to the peace of nothingness. Higher Dimensional Form: A cosmic void in absolute darkness where even time tends to slow down infinitely. Any energy and information that enters it will gradually dissipate and be forgotten.

Greed · The Ever-Hungry Maw Godhead: The cancerous law of infinite devouring and growth. He represents the system's instinct to lose balance and expand infinitely until it collapses. Not only matter, but also knowledge, emotions, and time are the objects of His devouring, but the devouring is only to satisfy the devouring itself. High-dimensional form: a super black hole that exists in the structure of space, but its horizon is composed of countless struggling and grabbing hands, sucking everything in forever, and the interior is infinitely compressed and meaningless "possession".

The Law of Silent Ark The core of "The Law of Silent Ark" is survival isolation. In the cosmic disaster set in "The Decameron", the protagonist group further understands that the essence of the chaotic "frequency band" is memetic pollution spread through perception and cognition. Therefore, when they subsequently summarized the law, they transformed the Confucian self-cultivation principle of "self-denial and restoration of propriety" that Chen Lao has studied for many years into a set of absolute defense protocols at the physical and information levels. The reasons are as follows: See no evil (essentially blocking visual pollution) Reason: Vision is the highest bandwidth perception channel, and it is also the most efficient way for the "frequency band" to distort reality and implant cognitive viruses. Looking directly at contaminated phenomena, symbols or even the victim's abnormal state may lead to direct infection or tampering of consciousness. Plot manifestation: Yao Chong's "Polluted Vision" ability is a double-edged sword - he can see the line of cause and effect, but he continues to suffer mental erosion because of it. The law requires that you avoid looking directly at "abnormalities", precisely to prevent ordinary people or those who are initially awakened with weak spiritual will from accidentally seeing direct cognitive collapse. Don't listen to evil (essentially blocking hearing and information pollution) Reason: Language, sounds of specific frequencies and even electronic signals may become carriers of "frequency bands". Hearing contaminated information will trigger mental associations and cognitive resonance, thus opening holes in consciousness. Story manifestation: Similar to the Apostle of Jealousy, the "whispers" of other "Seven Deadly Sins" Chaos Apostles, distorted communication signals, and even certain knowledge itself (such as the model studied by Shen Ruozhi) may become sources of infection. Law Requirements Filter all information input and only accept strictly purified, meaningless baseline signals. Don't say anything inappropriate (essentially blocking output and self-confirmation pollution) Reason: Speech is not only output, but also the confirmation and shaping of self-thinking. Describing pollution phenomena, repeating specific concepts, and even expressing certain emotions may strengthen the resonance between one's own consciousness and the "frequency band" and accelerate the alienation process. At the same time, words may also unintentionally become a medium for contaminating others. Story manifestation: the characters later. Be extremely cautious in your communication and avoid describing your own feelings in detail, in order to prevent the concept from being solidified and amplified in the collective consciousness and becoming an anchor for band attacks. Similar to what was said before, when you stare into the abyss, the abyss is also staring at you.

The first chapter that disappeared The first chapter has not disappeared, just because it is too theoretical and redundant. Since someone has brought it up, as a world view, it is really inappropriate to put it in the first chapter, so I will put this in the comments, so that those who don't understand the world view can get a general idea here. I will also pick out some more difficult content in the future. Please forgive me: In the beginning, "God" created the world. The earth is a chaotic void, facing the dark abyss. "God" said: "Let there be light." So there was light in the sky. Almost every civilization has its own version of the creation myth. Chaos was split, light separated from darkness, the earth emerged from the water, and life was born from the dust. The stories are different, but the structure is surprisingly the same: first there is a "state without rules", then the rules are "imposed", and then the world emerges from disorder. Six thousand years later, humans retold the same story in another language. It's not Oracle, it's not Hebrew, it's not Sanskrit. It's mathematics. The Big Bang took about ten minus 43 seconds, which is the Planck period. At this time, the temperature of the universe is about 10 to the power of 32 Kelvin. The four physical constants - gravity, electromagnetic force, strong nuclear force, and weak nuclear force have not yet been separated. They merge into some kind of single, unified entity. There are no particles, no fields, and no distinction between space and time. What is there is just an infinitely dense, symmetrical "structure" that cannot be called a structure. Physics calls it the "Planck state". In ancient theology it was called "chaos". Maybe they describe the same thing. About ten minus thirty-six seconds after the big bang, this grand unified state called the "Planck state" was broken. The temperature also dropped to about ten to the twenty-eighth power of Kelvin. Something happened—modern physics calls it "spontaneous symmetry breaking." The unified "structure" begins to disintegrate. The stronger "boss", the strong nuclear force, separated from it and began to "stand on its own." This is not a gradual process, but a phase change. To put it simply, this is like the process of water freezing under a standard atmospheric pressure - the moment the temperature reaches zero degrees Celsius, the randomness of the liquid molecules is "broken". A perfect, no-preference state, suddenly choosing a direction. God said: "Let there be a firmament between the waters." Therefore, the "water" was divided into clear and turbid, upper and lower. After the strong nuclear force separated from "chaos", it found a new "job", binding quarks into protons and neutrons - the original concept of matter was born. The beginning of the nameless heaven and earth, being is the mother of all things, and being is born from nothingness. This does not happen "naturally". Because the essence of symmetry breaking is that a perfectly symmetrical system could have remained symmetrical forever. It should not be "broken", because then the balance will be broken. But physics tells us that this is called random fluctuation. So what are random fluctuations? Random fluctuations do not exactly produce the specific coupling constant of the strong nuclear force. To put it simply, if you throw a handful of sand into the air, the sand will not turn into a glass of water. Symmetry breaking is not completely random. Its fate was determined when it was born. Approximately ten minus twelve seconds after the big bang, the electromagnetic force and the weak nuclear force also followed the big brother's footsteps and declared "independence". God said: "All things will grow on the earth." The electromagnetic force was shaped by "God" in this way. It was responsible for moving electrons around the nucleus of the atom - chemistry was born. If the electromagnetic force does not exist, then the atomic nucleus is just a naked proton and neutron group. Without the electron cloud, there will be no chemical bonds, there will be no molecules, no molecules, water, proteins, DNA, etc. Will not exist. It can be said that the electromagnetic force and its brother the strong nuclear force constitute the "original substance" of life. At this moment, the prototype of the material world was born. Its coupling constant is a fine structure constant α≈1/137 - it is exactly that value accurate to four decimal places. It's not 1/136. It's not 1/138. It is 1/137. Quantum physicist and Nobel Prize winner Volganf Pauli once said: "When I saw this number, I had a feeling as if God was kidding me." At the time, he did not know how accurate he was. About ten minus six seconds after the big bang, the strong nuclear force has completed its "work", solidifying quarks into protons and neutrons, and the electromagnetic force has also put electrons in place. After the two were combined - the first atoms were born, which are complete material individuals in the true sense. Hydrogen: one proton and one electron. The simplest and richest element in the universe was born in nothingness. God said: "Let there be light." Hydrogen atoms gathered, collapsed, and ignited nuclear fusion under the influence of Lao Si's gravity - the first stars lit up. Light emerges from the depths of matter. In the vacuum environment of the universe, the speed of light is approximately: 299792458 meters per second. No one knows why it is this speed instead of 3000000000. I am afraid only God himself knows. But "no one knows" does not mean "it is random." The above is the most common and well-known "Genesis" in physics - the Big Bang Theory. This explosion is not destruction, but rebirth, four separations, four divine sayings. These four forces are "spoken" by "gods", each with absurdly accurate constants, and each responsible for coupling in absurdly accurate ways. They have their own jobs: the strong nuclear force binds protons and neutrons in the nucleus, the electromagnetic force binds electrons, the weak nuclear force controls decay, and gravity controls relatively macroscopic large-scale structures. Without the operation of these four cosmological constants, the universe cannot operate. It's like a designed machine. Physicists don't like this conclusion. Not because it is unscientific - but because the word "design" implies a "designer". The job of physics is to explain the world, not to find reasons for the existence of the world. So they said: "There is no need for a designer. Even if there are two parallel universes in the multiverse, the constants are different. We happen to live in a universe with suitable constants, because we are not in the inappropriate universe. This is not a design, this is survivor bias." This explanation has a fatal flaw: it cannot be falsified. An explanation that can never be falsified and a belief that can never be proven are logically equivalent. Science used it to replace God, Pangu, Allah, and Brahma, and then discovered that this seemingly more advanced substitute had almost the same face as the replaced "god". The story begins on the silent abyss, with no light, no darkness, no time and no space. At that time, only the original thoughts were patrolling over the abyss, like the wind blowing through the non-existent sea. Then He said: Let there be light. The light splits the chaos like a sword, half burns into stars, and the other half condenses into the long night. The stars lined up and wrote unreadable inscriptions on the dome, and the heavens began to echo the first rhythm. The abyss recedes, the earth's spine rises from the undercurrent, and the mountains are its first bones. Rivers carve growth rings in the valleys, and the wind carries seeds and songs through the unnamed wilderness. At that time, the forest swept across the land like green flames, its roots clenched the soil, and its branches asked the sky. The sea was demarcated, and the back of the giant whale emerged from the water and became a swimming island. The first wings of the flying bird cut through the clouds and scattered the debris of the stars to the east—— From then on, there was dawn. Then, He took the breath soil from the earth, molded it into a form that could contain the light, and breathed a breath into its depths. The body opened its eyes, and the entire waking world was reflected in its pupils. People stand at the junction of morning light and dusk, with the new earth beneath their feet and the rotating bells of the gods above their heads. Everything is silent, waiting for him to name it all. Then the epic began to flow, from the afterglow of the seventh day of creation to the unfinished, human chapter.

TeV (teraelectronvolt) is a physical unit used to express energy, especially commonly used in particle physics and high energy physics. ‌Definition and conversion‌: 1 TeV is equal to 10^12 electron volts (eV), which is approximately 1.6×10^{-7} Joules. ‌Application fields‌: TeV-level energy usually appears in large particle accelerators (such as the Large Hadron Collider) or cosmic ray detection, and is used to describe the high-energy state of microscopic particles. ‌‌

Sievert (Sv) is the international standard unit, but because the value is too large, millisievert (mSv) or microsievert (μSv) is often used in daily life. 1 sievert = 1000 millisieverts. 1 millisievert = 1000 microsieverts. ‌‌ ‌Physical meaning‌: It is not a pure energy unit, but an "equivalent dose" that combines the type of radiation and the sensitivity of human tissue. It is mainly used to evaluate the potential damage of radiation to biological tissues. ‌‌

Power supply ripple refers to the high-speed voltage and current fluctuation waveforms that exist in the power supply system. These waveforms are easily coupled to the probe. The sources include magnetic field coupling of the power transformer, electric field coupling of the switch node, and common mode current generated by the mutual winding capacitance of the transformer. In the field of electronic engineering, the standard term for this phenomenon is "ripple" rather than "ripple". It is one of the core indicators for measuring power quality and manifests itself as a small AC component superimposed on the DC stability. ‌‌

Arrogance·The Solipsist Sovereign Godhead: the ultimate expression of absolute isolation and denial of others. He believes that only itself in the universe is real, and everything else is an illusion. Its power makes civilization fall into blind arrogance, isolation and involution, and eventually solidify and die in loneliness. High-dimensional form: a perfect, cold, self-replicating geometric structure that rejects all external information and attempts to assimilate everything it touches into a lifeless mirror image of itself.

Jealousy · The Mimetic Parasite Godhead: The source of creative exhaustion and vicious competition. He cannot create, but can only distortly imitate and try to take away the qualities, prosperity and existence of others. The civilization affected by it will fall into an endless zero-sum game and status anxiety. High-dimensional form: a shadow that is constantly changing shape, always showing the appearance of the civilization it has just swallowed or is coveting when it was at its most glorious, but the interior is extremely empty.

Gluttony·The Dissolver of Boundaries Godhead: Chaos incarnate of excess and excess. He dissolves all boundaries and forms, pursuing the ultimate sensory and existential experience until self and other, subject and object are completely confused. It is the ultimate process from self-indulgence to self-destruction. Higher Dimensional Form: A rainbow-colored viscous ocean that is constantly churning and integrating countless substances, colors, sounds and concepts. It is beautiful and terrifying. Those who enter will lose all form and independent consciousness.

Lust·The Web of Enmeshment Godhead: The law of blind attraction and compulsive union. Beyond mere desire, it is a twisted force that attempts to forcibly bind and integrate all independent existences into one, depriving individuals of their independence and free will. High-dimensional form: an infinitely extending giant network composed of activated gravitational threads and nerve cords. The captured civilized individuals will lose themselves and become network nodes, immersed in the eternal but empty pleasure of "connection".

"Abyssal Eye" is the internal code name for the "Seventh Generation Large Hadron Collider" or "Quantum-Consciousness Coupling Experimental Platform". Affiliated institution: Led by the European Center for Nuclear Research (CERN), but with an unprecedented global cooperative nature, it integrates top forces in the fields of high-energy physics, quantum information, neuroscience and even philosophy. Core person in charge: Dr. Carl Stark (Chairman of the CERN Council), representing pragmatism and technological optimism. Representatives of the Huaxia team: Yao Chong (data analysis researcher) and his mentor Professor Chen Dunli (the founder of cosmic ethical physics), and Liu Pan, a senior researcher in the detector safety team. They brought Eastern holistic thinking and early warning theories on the relationship between consciousness and matter. Key collaborator: Shen Ruozhi (ETH Zurich), responsible for the maintenance of quantum information and macroscopic quantum states. Beyond the Standard Model: Aims to detect or create material forms or energy states beyond those predicted by the current standard model of particle physics, which may involve research related to "extradimensional particles" or "pseudo-vacuum decay". Consciousness-matter coupling experiment: Try to verify whether "collective consciousness" or "observer effect" can have a measurable impact on extreme high-energy physical processes in a controlled environment. This may be an attempt to implement the technology of Professor Chen Dunli's theory. Exploring the nature of information in the universe: trying to get to the "source code" level of physical laws, exploring whether physical constants are variable, and whether their changes are related to the information structure in the universe (including consciousness information). The "Eye of the Abyss" symbolizes mankind's exploration of the boundaries of ultimate knowledge. The name "Abyss" not only refers to the unknown depths of physics, but also echoes Nietzsche's philosophical warning - "When you stare into the abyss, the abyss also stares into you." The tragedy of the project is that it finally allowed the "abyss" (that is, the evil thoughts and disorder in the collective subconscious of civilization) to have "eyes" and look back and even swallow reality.

The Decameron is a term used in ancient times to satirize the present. This book connects the whales backward and the visions that occurred in some non-waterlogged areas before the Ark was built with the "seven deadly sins" and "high-dimensional existence" of modern people. It is hoped that some existing social problems can be paid attention to by everyone and make society a better place. The allusion comes from "The Decameron", a collection of stories completed by Italian Renaissance writer Giovanni Boccaccio in 1353. It is known as the first realist masterpiece in the history of European literature. It is also called the "Human Comedy" together with Dante's "Divine Comedy". Core allusions (story frame): Time background: In 1348, the devastating Black Death (plague) broke out in Florence. More than half of the city died, social order collapsed, and people were panicked. Escape setting: In order to avoid the plague, seven young women and three young men met to take refuge in a quiet villa on the outskirts of Florence. Narrative structure: In order to survive the difficult time and maintain their sanity, they decided to each tell a story every day for ten days (two days of which they did not tell stories due to housework activities), hence the name "The Decameron", a total of 100 stories. Core themes and breakthroughs: Fighting disaster and nothingness: Using stories and narratives as spiritual weapons to fight death, fear and social collapse embodies the humanist spirit's affirmation of life, wisdom and happiness in disasters. Satire on the church and feudal ethics: A large number of stories satirized the hypocrisy, greed and stupidity of the priests, challenging the authority of the medieval church. Praise to love and wisdom: Praising the equality of men and women, freedom of love and individual intelligence, many stories revolve around the life and witty behavior of the citizen class. The beginning of realism: The background of the story changes from the mythical knight to secular life. The language is popular and vivid, creating many vivid images of businessmen, craftsmen, monks, etc., And laying the foundation of European short stories. The tribute in this book mainly focuses on the fight against disaster and nothingness and science fiction realism. Disaster upgrade: from the Black Death to a "frequency band" disaster at the rule level, from physiological death to the collapse of consciousness and physical rules. Location transformation: From a pastoral villa to a high-tech "CERN underground fortress", science and survival have become the core contradiction. Deepening of the narrative function: The characters in the Decameron mainly explore human nature and satirize society through "telling stories"; the protagonist group "personally experiences" the invasion of the "original sin frequency band" corresponding to each night. The narrative and survival actions are combined into one to explore the struggle, awakening and cooperation of human nature under extreme conditions. Theme continuation and expansion: It inherits the original work's discussion of the multi-faceted nature of human nature, and adds modern philosophical thinking such as collective consciousness, technological ethics, and the law of cause and effect in a science fiction setting.

Electromagnetic force is the general term for the forces exerted by charges and currents in the electromagnetic field. It includes electrostatic force and magnetic force and is one of the four basic interactive forces in nature. It is not only limited to the Coulomb force between stationary charges, but also involves the Lorentz force experienced by moving charges in the magnetic field and the Ampere force experienced by current-carrying conductors. Its work is closely related to changes in electric potential energy. ‌‌ Attributes of force‌: The electromagnetic force is the second strongest force among the four basic forces in nature, second only to the strong interaction force, and is a long-range force. ‌Transmission Mechanism‌: In quantum electrodynamics, electromagnetic force is transmitted by exchanging ‌photons‌. Photons act as gauge bosons to mediate the interaction between charged particles. ‌Macroscopic manifestation‌: The friction, elasticity, tension and other contact forces experienced in daily life are all macroscopic manifestations of the electromagnetic force between atoms. ‌‌ Electrostatic force (Coulomb force)‌: Acts on stationary charges in the direction that like charges repel and dissimilar charges attract. Electric field force formula: F = qEF=qE, where qq is the amount of charge and EE is the intensity of the electric field. ‌‌‌ ‌Magnetic field force‌: ‌Lorentz force‌: The moving charge receives a force in the magnetic field, F = qvBF=qvB (when the speed is perpendicular to the magnetic field), the direction is always perpendicular to the speed, and no work is done. ‌Ampere force‌: The force exerted on a current-carrying conductor in a magnetic field, F = BILF = BIL (when the conductor is perpendicular to the magnetic field), is the main source of power for motor driving. ‌‌‌ ‌Uniform description‌: When the electric field and the magnetic field exist at the same time, the total electromagnetic force experienced by the moving charge is uniformly expressed by the Lorentz force formula: F = q(E + v \times B)F=q(E+v×B). ‌‌‌ Theoretical system and microscopic mechanism 1. ‌Classical theory‌: ‌Maxwell's equations‌: The first principle of classical electromagnetism, which uniformly describes the four effects of electrostatics, electrostatics, electromagnetism, and magnetism, and predicts the existence of electromagnetic waves. ‌Energy relationship‌: Electrostatic force is a conservative force, and its work is equal to the reduction of electric potential energy. The direction of the force on the charged body tends to reduce the field energy. ‌‌‌ 2. ‌Microscopic mechanism‌: ‌Atomic structure‌: Negatively charged electrons and positively charged nuclei combine to form atoms through electromagnetic force. The nature of chemical bonds and intermolecular forces are also electromagnetic forces. ‌Quantum Description‌: At the atomic scale, quantum electrodynamics (QED) is needed to describe electromagnetic interactions, which explains the interaction mechanism between light and matter. ‌‌

Perturbation is a concept widely used in physics, astronomy and mathematics. It mainly refers to small disturbances or modifications to the original state of the system or the ideal model. 1. Core definition ‌Basic meaning‌: It refers to a system that is affected by small external forces, fields or parameter changes, causing its state to deviate from the original ideal solution or equilibrium state. ‌Terminology Difference‌: In the field of astronomy, the English "perturbation" is often translated as "perturbation" or "perturbation"; while in the fields of atomic physics and quantum mechanics, it is usually translated as "perturbation". ‌‌ 2. Main application fields ‌A. Quantum mechanics and physics (perturbation theory/perturbation theory)‌ This is the context in which the word "perturbation" most often appears. When complex quantum systems cannot be solved accurately, scientists use ‌perturbation theory‌ to find approximate solutions. Principle‌ Decompose the Hamiltonian HH of the system into two parts: H_0: ‌Unperturbed part‌, which is a simple system (such as hydrogen atom) that can be solved accurately. H': ‌Perturbation part‌, which is a smaller interaction term (such as the interaction between electrons, external electric field, etc.). ‌Method‌: Based on the exact solution of H_0, the influence of H' is expanded step by step (first-level correction, second-level correction, etc.) As a small quantity, thereby approximating the energy and wave function of the real system. ‌Classification‌: ‌Steady-state perturbation theory‌: deals with perturbations that do not change with time and is used to calculate energy level movements (such as Stark effect, Zeeman effect). ‌Time-dependent perturbation theory‌: deals with time-varying perturbations and is used to calculate transition probabilities (such as light absorption and emission, radioactive decay). ‌‌ B. Celestial Mechanics (Perturbation/Perturbation)‌ In astronomy, perturbation refers to the deviation of the actual orbit of a celestial body from an ideal conic section (such as Keplerian ellipse). ‌Reason‌: Ideally, a two-body problem (such as the Earth orbiting the Sun) follows Kepler's laws. But in reality, there are third bodies (such as the moon's gravity due to the sun, the gravity between planets), and these additional gravitational forces are "perturbations." ‌Application‌: By calculating perturbations, the discovery of Neptune (based on the perturbations of Uranus's orbit), the long-term evolution of the moon's orbit, etc. Can be predicted. ‌‌ C. Other fields of science and engineering‌ ‌Electromagnetics and Microwave Engineering‌: ‌Slater's perturbation theorem‌ is used to analyze the shift of the cavity resonant frequency due to structural deformation, and is widely used in filter tuning and field strength measurement. ‌Chemical Engineering‌: ‌Ultrasonic perturbation effect‌ refers to the small perturbation generated by ultrasonic cavitation that accelerates solute diffusion and strengthens the solid-liquid mass transfer process. ‌Mechanics‌: ‌Mechanical perturbation‌ refers to the small impact of external forces or fields (such as changes in the gravity field) on the equilibrium state of the system. It is often used in space biology to study the response of cells to microgravity. ‌‌ 3. Applicable conditions Perturbation theory is not omnipotent. The premise for its validity is: ‌Divisibility‌: The system must be clearly divided into "solvable major parts" and "tiny minor parts". ‌Smallness‌: The perturbation term must be small enough (H'≪H_0) to ensure that the series expansion converges quickly. If the perturbation is too large, the perturbation theory fails and the variational method or other numerical methods need to be used. ‌‌ In short, ‌Perturbation‌ is a scientific thinking and methodology that "starts from a known simple solution and gradually corrects it to approximate the complex real solution."

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