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enter image description here

What is the font for "b" letter?

marked as duplicate by user156344, Raaja, Stefan Pinnow, TeXnician, Mensch Apr 19 at 9:46

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    Looks like \flat. – Bernard Apr 18 at 17:43
  • How to use this statement? – Minh Apr 18 at 17:46
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    Welcome to tex.sx. The first part of this expression would be coded $f^{\flat} ...$. – barbara beeton Apr 18 at 17:49
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    So... two different new contributors ask about the \sharp and \flat symbols within 3 hours of each other? tex.stackexchange.com/questions/485484/… – James Apr 18 at 18:29
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    @James seems only natural ... – davidbak Apr 18 at 20:55
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\documentclass{article}

 \begin{document}

 \[ f^{\flat}\colon R \longrightarrow R \]%

\end{document} 

enter image description here

  • @Mico: you're perfectly right. I've updated accordingly. – Bernard Apr 18 at 18:27
  • [![enter image description here][1]][1] [1]: i.stack.imgur.com/LwJz8.png What is the font of the letter look like "X"? – Minh Apr 19 at 4:54
  • It is simply the Greek letter χ (\chi, to be used in math mode). – Bernard Apr 19 at 8:18

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