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There is $\mathbb Z^-$, $\mathbb Z^*$, $\mathbb Z^+$. There does not seem to be a notation for negative integers and zero.

KeithSmith
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1 Answers1

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If you wrote $\Bbb Z_{\le 0}$, I’m quite sure that you’d be understood, and I have seen this notation.

Brian M. Scott
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