Euclidean geometry is an axiom system in geometry used to prove all "true propositions".
Russell from England began studying Euclidean geometry at the age of 11. He said: "I never thought that there was such wonderful knowledge in the world. It is as dazzling as first love."
When I first saw you when I was 17 years old, I never imagined that there would be such a wonderful person in this world. Just like European geometry, you were my unexpected and dazzling first love.