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,