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When the set of Natural numbers are denoted as "N" and that of Whole numbers as "W", why is the set of Integers denoted as "Z"?

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Taken straight from the wikipedia article on integers: "The set of all integers is often denoted by a boldface Z (or blackboard bold $\mathbb Z$, Unicode U+2124 ℤ), which stands for Zahlen (German for numbers, pronounced [ˈtsaːlən])." – Srivatsan Oct 12 '11 at 3:18
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While (possibly almost) all of us have asked this question, it's rather useless. Combine that with the ease in finding the answer (cf @Sri 's comment)... (-1) – The Chaz 2.0 Oct 12 '11 at 3:21
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@Andrea: Apparently not, see Jeff Smith's page. He says $\mathbf{Z}$ and $\mathbf{Q}$ are due to Bourbaki, while van der Waerden used $C$ and $\Gamma$ for integers and rational numbers. – t.b. Oct 12 '11 at 13:14
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Interesting about van der Waerden. I got my copy off the shelf (1959 edition in German). This does have $\mathbb Z$ and $\mathbb Q$. Not really a disproof of Jeff Smith's page. – GEdgar Oct 12 '11 at 14:41
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