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how do i show, a is an integer 1) a|0? 2)0|a?

Discrete Math
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does 0 divide anything?
no.
but I don't see how either show a is an integer, maybe i'm missing something.

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Other answers:

a is an integer is a condition. i just need to prove it or sth. my textbook is very subtle about requiring wat form of proof.
a is an integer if it can be generated by <1>
you are saying a is an integer and you need to prove a|0 and 0|a?
yeah. or show, as the textbook puts it.
well part 1 makes no sense because 0 is in integer and 0 does not divide 0, and the second part makes no sense because nothing divides 0. So you can't prove either.
ah well. thanks anyway.
is this exactly as the book shows the question?
yeah.
you can say, if a is an integer and a is not 0, then 0=K*a when k=0, so a|0 because k is an integer (by definition of a|b), for part two nothing divides 0 is your counterexample:)
wow. right. thanks.

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