Functions and Poetry

Functions have solutions and poems have rhyme, but Shen Xu spent six years and still couldn't solve Xu Nian's question. He is a master in liberal arts, and can use fourteen rhetorical figures to describe the moon, but cannot calculate trigonometric functions; she is a master in science, and can mentally calculate higher-order equations, but cannot read "Chunfeng Bu Jie Yi". When the class teacher forcibly tied these "two evil people" into "mutual and complementary deskmates", no one expected that this transaction would last for six full years. From 38 points to 118 points, from 72 points to 115 points, Shen Xu hid eight hundred love letters in math problems, and Xu Nian turned six years into a logically rigorous proof problem. He used the "elevator algorithm" to teach her the addition and subtraction of rational numbers, and she used the "coordinate system method" to teach him to analyze "Guan Cang Hai"; he remembered the days of her menstrual period, but she regarded his acrostic poems as a code book. The rooftop gambling at the beginning, the artistic performance in the second year of high school, and the hundred-day oath of devotion in the third year of high school. From the three-kilometer distance between the east and west campuses to the 13-minute subway ride from Tsinghua and Peking University, from "Known: Shen Xu is bad at math" to "Proving: I will be you for the rest of my life", this secret love was like a long mathematical induction, and Yumu Nao finally deduced the last step one afternoon in the second year of high school. "Function and Poetry" - the final question that has been solved for six years, the answer is each other.