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How to check whether this function is $SURJECTIVE$ or $NOT$?

in Mathematical Logic by (699 points) | 16 views
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GAITONDE gave u an answer about this i think.
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Where?
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Here $0$ mapped twice.

when $x=0$, function gives $0$, when $x=-2$ function gives $0.$

So, not one to one.

And not onto, because it only maps even numbers.

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