What jokes are suitable for people who study mathematics?

A math professor at Moscow University jumped to Harvard and was asked to teach mathematical analysis as soon as he arrived, so he ran to ask other professors, "What should I teach in this course?" Someone told him, "Just teach limit, continuity, differentiability and add some indefinite integrals." The next day, he came over and asked other professors, "What should I teach in the second class?" A person commented on Anonymous: "If you draw a triangle on your chest, the sum of the internal angles must be 180 degrees." The boy fell in love with the girl. He confessed to her, but the girl refused. She said, I am one year older than you. The boy said: when I 1 month, you 13 months. You are 13 times of mine. When I was 2 months, you 14 months. You are seven times older than me. When I was one year old, you were two years old, and you were twice my age. As long as you are willing to stay with me forever, we will always get closer and closer. How wonderful the story used by the math teacher to tell the limit is!