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How can i make a sum symbol to ask a math related physics question?

I mean Riemann Sum.

What is the short cut of Riemann sum or how can i ask a question that has mat symbols, formulas?

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You start with the section in the FAQ on symbols and notation, and then search the web for help with LaTeX's mathmode symbols.

Or you can find a post that has the symbol you're looking for and use the "edit" button to get a look at the source ans see what they used.

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    $\begingroup$ Or just right click the symbol and select "Show Math as" then "TeX commands". $\endgroup$ – John Rennie Apr 2 '13 at 17:48
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Or, you can try Detexify. Just draw the symbol you are looking for, and this website will look it up in the database.

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