Question

the set of irrational number is denoted by

Answer 1

the set of irrational numbers is expressed as the set of all real numbers "minus" the set of rational numbers, which can be denoted by either of the following, which are equivalent: R Q R ∖ Q , where the backward slash denotes "set minus".

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Answer 2

Irrational numbers are denoted as set of all No's except rational No's and real No's.