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here is the picture of this symbol:

enter image description here

How should I do to get it in math-mode? Thanks.

marked as duplicate by Werner, Sean Allred, Sigur, Mike Renfro, user13907 Jul 5 '15 at 19:17

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Seems to be \mathfrak{X} from the amssymb package. You can find this out yourself using http://detexify.kirelabs.org/classify.html.

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