√ Mathematically called "root sign", which means to find the arithmetic square root of a number. (that is, the square is equal to the positive number of this number). Negative numbers have no arithmetic square root. What is the arithmetic square root of real number A? , where a≥0 is defined as ≥0.

Extended data

Similar mathematical symbols:

c？ Number of combinations

A (or p)? number of permutations

n？ Total number of elements

r？ Number of elements participating in the selection

! ? Factorial, such as 5! =5×4×3×2× 1= 120, specify 0! = 1

! ! Half factorial (also called double factorial), for example, 7! ! =7×5×3× 1= 105, 10! ! = 10×8×6×4×2=3840

σ addition

References:

Baidu Encyclopedia "Root Number"