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Possible Duplicate:
Left and right subscript

I want to use annihilators in maths. I can write $I^\perp$ but I do not know how I can write perp in left hand side not the right hand side. Would you please help me in this regard.

Sorry for the poor English in advance.

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sasa
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    Possible duplicates are : http://tex.stackexchange.com/questions/30554/superscripts-before-a-letter-in-math and also http://tex.stackexchange.com/questions/11542/left-and-right-subscript You can also search for \sideset and \prescript commands on this site. – percusse Aug 29 '12 at 09:09
  • Would $^{\perp}I$ do it? – Tom Bombadil Aug 29 '12 at 16:41

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