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How can I type the "isomorphic","not equal" and "the set of integers , rationals and reals" symbol ?

What is the code ?

$=$ means equal, how to write "not equal"

What about real numbers, rationals, natural numbers and integers?

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3 Answers 3

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$\cong$ for $\cong$

$\ne$ for $\ne$

$\mathbb{R}$, $\mathbb{Q}$, and $\mathbb{Z}$ for $\mathbb{R}$, $\mathbb{Q}$, and $\mathbb{Z}$, respectfully.

See here to learn how to do it all.

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  • $\begingroup$ thanx :) what about the symbol of generated group ? $\endgroup$
    – FNH
    Commented Jun 10, 2013 at 0:34
  • $\begingroup$ @MathsLover That's something you will find by following the link in the answer, or the links given there. Or from the source code of posts on the main site, which you can see by clicking edit. $\endgroup$ Commented Jun 10, 2013 at 1:11
  • $\begingroup$ ok :) i will explore :D $\endgroup$
    – FNH
    Commented Jun 10, 2013 at 1:35
  • $\begingroup$ respectfully. ;-) $\endgroup$
    – peter
    Commented Jan 24, 2021 at 10:45
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One method for finding the LaTeX for a character is to draw it on http://detexify.kirelabs.org/classify.html

screenshot

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You can practice all the symbols here

http://www.codecogs.com/latex/eqneditor.php

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