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English concepts in mathematics
Z represents a set of integers in a set.

N stands for the set of natural numbers in the set.

Q stands for rational number set.

R stands for real number set.

N* or Z+ represents a set of positive integers.

C: constant

A constant refers to a fixed value, such as a function, y=ax+bx+c, where c is a constant and does not change with x, such as pi and e, which are all real numbers.