IntroAnalysis
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Homework Statement
Let A = [Q\bigcap(0,\infty)] \bigcup {-1} \bigcup(-3, -2]
Homework Equations
So A = (0,\infty) \bigcup{-1} \bigcup(-3,-2]
The Attempt at a Solution
I understand that the Rational numbers are cardinally equivalent to (0,\infty),
but why isn't the intersection of Rationals and (0,\infty) =>(0,\infty)\Irrationals ?