In fact, math diary usually keeps a diary in peace. In addition to recording things related to mathematics, he can also record mathematical stories around him. Can write about the application of mathematics in life; You can write about the mathematical phenomena you see and the mathematical problems you think of; Can write math-related stories; You can introduce the math knowledge you read in the book, including interesting math, math stories, math jokes, mathematicians' introduction, and how to play math games. You can write an answer to a math problem by yourself; You can also write about your experience in learning mathematics and your learning methods.