The sets that is equal to {1, 2, 3, ...} is {x | x ? N, x = 1} ; {x | x ? N, x = 1} means:

X where X is in the set (?) of (N)atural number (counting numbers, 1, 2, 3, 4, etc) where X is greater than or equal to 1. This is your guy.

The R is for real numbers, and that would be 1, all the numbers between 1 and 2 (like 1.33 repeating, the square root of 3, 1.7, etc), 2, all the numbers between 2 and 3, 3, all the numbers between 3 and 4, etc.

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