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Does anybody know what the correct latex is for the character which looks like a Y in this equation?


I've sometimes seen it used for the Euler homogeneity operator too.

I can't seem to produce it from any of the standard math fonts, nor can I find it in the Hebrew or Russian alphabets! Any thoughts would be great!

marked as duplicate by zeroth, Tobi, Matthew Leingang, cmhughes, clemens Apr 15 '13 at 18:52

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That's a Greek letter \Upsilon.

  • Thanks - that's great. Just looking in the wrong alphabets I guess! – Edward Hughes Apr 15 '13 at 18:42
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    When in doubt, it's Greek. Hebrew and Russian letters have very rare occurrences in math. – Ryan Reich Apr 15 '13 at 18:44
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    Well, it occurs in exactly one way, and aside from Bet (which is much less common and occurs in the same way), it's the only Hebrew letter to do so. And the only Russian letter I know of is Sha; I suppose arithmetic geometers would say that's important, but in both cases, I maintain that you basically have to know you're looking at these letters if you see them. – Ryan Reich Apr 15 '13 at 18:50
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    Maybe I should say: use of non-Greek letters in math is considered idiosyncratic. – Ryan Reich Apr 15 '13 at 18:50
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    I'd like to add that this is a mathematical capital upsilon. The regular capital upsilon looks exactly like the capital Y (which is why the mathematical capital upsilon is written this way). People familiar with the Greek alphabet (but unfamiliar with this mathematical variant) would probably try to find it in a different alphabet. – Silke Apr 15 '13 at 19:38

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