On the tombstone of Archimedes, a great mathematician, an interesting geometric figure is engraved: a sphere is embedded in a cylinder. According to legend, this is Archimedes' favorite theorem before his death. Mathematician Rudolph's tombstone is engraved with 35 digits of pi, which is called "Rudolph number", which is the crystallization of his lifelong efforts.

The strangest epitaph is the ancient Greek mathematician Diophantu. His epitaph is a riddle-like math problem: "One sixth of his life is a happy childhood; After living for twelve times, a thin beard grew on his cheek; It took another seventh of my life to get married; In five years, he felt very happy and got a son. But the child's brilliant life is only half that of his father; After the death of his son, the old man lived in grief for four years, ending his earthly career. " Thanks to this peculiar epitaph, later generations can understand that the last great mathematician in ancient Greece died at the age of 84, so it is natural to calculate when he got married, when he had a son and when his son died. The algorithm of its age is: let the age be X, then there is X/6+X/ 12+X/7+5+X/2+4 = X, and the solution is X = 84 (years old).