Cardinal numbers and sets

Reference no: EM13121989

I read that a range of expression is a set of values of a given expression. This set may consist of the whole set of cardinals numbers xy or of a proper subject of the set of cardinals (as the expression 2x, whose range is the even cardinals).

What I need to know is what is " the whole set of cardinal numbers" and a "proper subject of the set of cardinals. Please provide a few examples.

Reference no: EM13121989

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