Horses, wandering in the garden of mathematics

Mathematics and Thinking, Mathematics Culture, Mathematics and Creation Open the Window of Mathematics —— Chu Shi on Middle School Mathematics Learning

Ubiquitous mathematics, 660 questions of mathematical foundation, make a fun game of mathematical genius 1900 to develop thinking.

Square Root of 2: Dialogue between a Number and a Sequence I prefer the book David Flanner. Relatively speaking, he is not so boring and the content is relatively interesting.