1

This question already has an answer here:

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

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.

4

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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