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This question already has an answer here:

How can we write number sets symbols using Mathjax? For example what's the code for Natural numbers set? I couldn't find that in a vast of Mathjax help documents,and the only one I found doesn't work: \Natural or \mathds{N}

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marked as duplicate by user296602, Shailesh, Joel Reyes Noche, choco_addicted, JMP Jun 17 '16 at 4:39

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    $\begingroup$ \Bbb{N} gives $\Bbb{N}$ here. But at least the TeX system on my laptop says that is outdated. $\endgroup$ – Jyrki Lahtonen Jun 16 '16 at 21:10
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    $\begingroup$ (In particular, see point 9 about fonts). $\endgroup$ – user296602 Jun 16 '16 at 21:11
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    $\begingroup$ @JyrkiLahtonen Is there any more beautiful symbol for natural numbers set depictable by Mathjax? $\endgroup$ – Hamid Reza Ebrahimi Jun 16 '16 at 21:12
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One way is to use \mathbb{N}. This produces:

$$\mathbb{N}$$

This is very common.

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    $\begingroup$ Any other alternative? $\endgroup$ – Hamid Reza Ebrahimi Jun 16 '16 at 20:53
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    $\begingroup$ Do you know why \Natural or \mathds{N} don't work? The latter was offered by Detexify! $\endgroup$ – Hamid Reza Ebrahimi Jun 16 '16 at 20:56
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    $\begingroup$ @HamidRezaEbrahimi: I don't know. I have never seen \Natural used before. $\endgroup$ – Thomas Jun 16 '16 at 20:59
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    $\begingroup$ Where can I find the most comprehensive Mathjax documentation? $\endgroup$ – Hamid Reza Ebrahimi Jun 16 '16 at 21:00
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    $\begingroup$ @HamidRezaEbrahimi: Probably here: docs.mathjax.org/en/latest $\endgroup$ – Thomas Jun 16 '16 at 21:01
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    $\begingroup$ Thank you so much Thomas $\endgroup$ – Hamid Reza Ebrahimi Jun 16 '16 at 21:02
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    $\begingroup$ @HamidRezaEbrahimi: you are welcome. $\endgroup$ – Thomas Jun 16 '16 at 21:03
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    $\begingroup$ Probably \Natural and \mathds are part of some macro package, so you need to include that package to use them... $\endgroup$ – GEdgar Jun 17 '16 at 12:46

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