What is the difference between $Z_{+}$ and $Z_{++}$? Is the first all the non-negative integers and the second all the positive integers?
What does this symbol mean in math? ($Z_+$ and $Z_{++}$)
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notation
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1Where did you find the latter notation? – 2012-05-23
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0@anon: in a linear programming book. – 2012-05-23
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0Can 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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3The 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