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Just want to know how to type this symbol in Latex. I saw it used in the axioms of probability. Thanks.

egreg
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user73645
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    Welcome to TeX.SX! \usepackage{amssymb} and \mathfrak{F} should do. – egreg May 03 '14 at 23:23
  • Seems to be Euler fraktur bold (see http://tex.stackexchange.com/questions/58098/what-are-all-the-font-styles-i-can-use-in-math-mode). – Karlo Nov 04 '15 at 09:15

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