Radical sign is an operation in the field of mathematics, which refers to the operation and reduction of the same multiplication number by looking at their products. The handwritten and printed characters of the radical sign are represented by √ ~, and the numerical or algebraic expression of the radical sign is written by the symbol ~, which cannot be written too big or too small.

Mathematics is a subject that studies concepts such as quantity, structure, change, space and information. Mathematics belongs to formal science, not natural science.

Mathematics is a universal means for human beings to strictly describe abstract structures and patterns of things, and it plays an important role in human life and social development.

Mathematics, called "arithmetic" in ancient times, is an important subject in ancient Chinese science. Many famous achievements in modern mathematics research are named after mathematicians in China.