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This question already has an answer here:

Could someone please help me with the Latex code for the symbol below?:

enter image description here

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marked as duplicate by yo', doncherry, Stefan Kottwitz Feb 27 '13 at 22:47

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 3 down vote accepted

The symbol you are searching for is: \nleq

Found via: http://detexify.kirelabs.org/classify.html

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Welcome to TeX.sx! A tip: You can use backticks ` to mark your inline code as I did in my edit. – Tobi Feb 27 '13 at 22:25
Thanks, I'm not used to the TeX.sx markup yet :-) – user26372 Feb 27 '13 at 22:25
The \nleq symbol requires \usepackage{amssymb} – egreg Feb 27 '13 at 22:26

Another way (the original way before amssymb) is \not\leq

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