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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?

marked as duplicate by Najib Idrissi, Joel Reyes Noche, Surb, Aaron Maroja, Daniel W. Farlow Apr 28 '15 at 7:24

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up vote 19 down vote accepted

$\cong$ 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.

  • thanx :) what about the symbol of generated group ? – Fawzy Hegab Jun 10 '13 at 0:34
  • @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. – ˈjuː.zɚ79365 Jun 10 '13 at 1:11
  • ok :) i will explore :D – Fawzy Hegab Jun 10 '13 at 1:35

One method for finding the LaTeX for a character is to draw it on http://detexify.kirelabs.org/classify.html

screenshot

You can practice all the symbols here

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

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