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How to write the following symbol in LaTeX

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that's used for Banach algebras.

marked as duplicate by egreg symbols Sep 27 '18 at 12:51

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It is a fraktur "E".


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Interestingly, while http://detexify.kirelabs.org/classify.html is usually very good with this, I was not able to get auto-recognition of the fraktur E.

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