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Rational numbers/Squaring/Exercise
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Rational numbers
Is the mapping
Q
≥
0
⟶
Q
≥
0
,
x
⟼
x
2
,
{\displaystyle \mathbb {Q} _{\geq 0}\longrightarrow \mathbb {Q} _{\geq 0},x\longmapsto x^{2},}
injective
? Is it
surjective
?
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