What do the letters R, Q, N, and Z mean in math?

In math, the letters R, Q, N, and Z refer, respectively, to real numbers, rational numbers, natural numbers, and integers.

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The letters R, Q, N, and Z refers to a set of numbers such that:

R = real numbers includes all real number [-inf, inf]

Q= rational numbers ( numbers written as ratio)

N = Natural numbers (all positive integers starting from 1. (1,2,3....inf)

z = integers ( all integers positive and negative ( -inf, ..., -2,-1,0,1,2....inf)

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