Natural number set n

Positive integer set N* or N+

Integer set z

Rational number set q

Real number set r

Complex set c

Symbol set, English name a? Collection? Yes? Symbol, a group of expression symbols of mathematical branches, is mainly used in the computer field.

In addition to the number setting symbols, there are also operation symbols, such as operation symbols:

Such as plus sign (+), minus sign (-), multiplication sign (× or), division sign (÷ or/), union of two sets (∩), intersection (∩), root sign (√ ~), logarithm (log, lg, ln,