I saw a web-site someday -- it had lots of codes for formulas from many fields of knowledge -- all categorized and searchable. So that when You teach, say, electrodynamics You could come there and get the code for Maxwell equations right away. I lost the linke and can't find the web-site any more.

Do You happen to know some sites like that?

Edit:

summary of solutions:

  • http://www.equationsheet.com/
  • Go to wikipedia, find the equation, copy its image as text with Ctrl-c -- and LaTeX code of image gets into the clipboard.
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    That's either Wikipedia and right click or Springer's LaTeX search. latexsearch.com – percusse Jun 15 '13 at 9:01
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    Browser history couldn't help? – Przemysław Scherwentke Jun 15 '13 at 14:56
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    I'm not sure why this is a (La)TeX question. Isn't it about finding a specific website or am I missing something? – Svend Tveskæg Jun 17 '13 at 9:54
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    @SvendTveskæg: this might be true. Still who else will know the answer to this question, but the latex community? – Adobe Jun 17 '13 at 11:21
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    @percusse -- warning about latexsearch: the code is not always "clean"; it obviously has not been edited for consistency and optimal appearance. in addition, some of the symbols in the latex code are not shown in the output (i saw two instances of upright greek caps -- \Uppsi and \Updelta -- omitted in the responses from a random search using one of the suggested search examples). while this might get one started, the output should always be reviewed for well-sized matching delimiters, proper spacing and alignment, etc. – barbara beeton Jun 17 '13 at 17:48
up vote 5 down vote accepted
+100

Maybe you mean Equations sheet? (Example of LaTeX code)

  • That's cool. The web-site seems like a fork of the link I posted. – Adobe Jun 18 '13 at 9:30
  • @Adobe which link? – domenico camasta Jun 18 '13 at 9:31
  • Here – Adobe Jun 18 '13 at 9:32
  • uh, for some reason I didn't see your answer – domenico camasta Jun 18 '13 at 9:33
  • In the "fork" you can also login (no idea why you should do that, but I assume it's a feature :P) – domenico camasta Jun 18 '13 at 9:36

Today I've been re-reading my LaTeX notes and I fount the link there: http://equplus.net

The web-site is made by a girl and a cat.

  • @mozartstraße: this web-site is a good start. I'd say a larger collection is due. I think I'd start collect formulas I type. An on-line wiki resource dedicated to latex codes of formulas categorized by field would be great. – Adobe Jun 18 '13 at 9:24

Even if you're not logged into Wikipedia, you can go to Edit Page and have the MathML/LaTeX markup code for any equations on that page.

  • View image info on the equation image also can provide a LaTeX code in associated text. – g.kov Jun 18 '13 at 1:19
  • Even greater: if You just copy the image of equation in Your browser as text (select it and press Ctrl-c) -- the latex code of image gets into a clipboard. – Adobe Jun 18 '13 at 9:42

for example two sources:

  • The second is cool. – Adobe Jun 17 '13 at 11:46
  • I just realized that Wolfram changed the behaviour of their formulars. In former times they used the alt field for the LaTeX code of all formulas ... :-( – Herbert Jun 17 '13 at 11:57

Check this link, contains many commands http://www.ntg.nl/doc/biemesderfer/ltxcrib.pdf

  • That't cool cheatsheet, but I was asking for latex codes of complete equations. – Adobe Jun 18 '13 at 9:02

Another great resource: http://www.mathtran.org

It's searchable and viewable without registration.

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