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What is the difference between $Z_{+}$ and $Z_{++}$? Is the first all the non-negative integers and the second all the positive integers?

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    Where did you find the latter notation?2012-05-23
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    @anon: in a linear programming book.2012-05-23
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    Can you give some context, e.g., tell us the sentence it appears in, and perhaps the sentence before and after it? (I would've said the difference is that the second one has a typographical error, but maybe that's not really correct. :))2012-05-23
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    The meaning can vary by context. I've not seen the latter, but the former can mean the positive integers (or even the nonnegative integers), or even "the integers as a group under addition"). The book should explain the notation *somewhere*...2012-05-23

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