Write Symbol
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http://www.unicode.org/charts/ has charts with all the symbols defined by unicode. Qt handles unicode, so any of them works, provided your font contains the symbol.
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One way to get an image on your button, is to use QToolButton instead of QPushButton. You can use a QAction to represent the operation (root, cube root, etc.) or constant (pi, e, etc.). You can associate an image with a QAction, and it will be rendered on your tool button automatically.
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I think a great library of fonts (but with fees: http://new.myfonts.com/search/tag:math/fonts/)
MS Word (2007+) uses this font: http://www.microsoft.com/typography/fonts/family.aspx?FID=360Free font(s): http://www.micropress-inc.com/fonts/tmmath/tmmain.htm
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[quote author="Peppy" date="1305723664"]I've got some fonts which has this especial function (mathematical fonts) ... Images (for me) aren't good solution, but in any way you will need to do a lot of positioning (indexes, powers of number, roots, sums, prods, and so on...)[/quote]
What are you talking about? Positioning? How? What kind of positioning do you think needs doing if you just want to put it on a button?
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That is a different issue, Peppy. You are confusion the discussion. The topic starter was after buttons:
[quote author="Pissio" date="1305708726"]This symbol are represent in a push button. How can I insert the image on the button?[/quote]
It is for that purpose that I suggest to use images. If you want to create editable formulas in some kind of editor, you are dealing with quite another topic.