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I have tried to use this symbol in one of my equations:

\mathfrak{\mathcal{l}}

But, instead of showing that letter in mathcal and mathfrak styles, it shows updownarrow?!

I mean: \mathfrak{\mathcal{l}} gives exactly the same command of \updownarrow

Is it something wrong going here or there is a logical explanation?! I have checked it in WinEdt and also in the following online LaTeX equation editor: https://www.codecogs.com/latex/eqneditor.php

Both give the same result!!

Thank you so much

Sitra
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    \mathfrak and \mathcal are not ornaments to a font (in the manner of \hat or \dot). Rather, they are separate fonts in themselves. Thus, it makes no sense to try to combine them as you did. – Steven B. Segletes Sep 29 '19 at 22:46
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    also the is no lowercase mathcal. See https://tex.stackexchange.com/questions/231322/how-to-get-the-lowercase-calligraphic-symbols if you need a caligraphic. – c.p. Sep 29 '19 at 22:46
  • What would a calligraphic fraktur letter be? (Accepting of course fraktur is a kind of calligraphy, but a very different kind to the loopy kind represented by \mathcal) – Au101 Sep 30 '19 at 01:12
  • Your second question is completely separate from the first one, and in general it's better to make two posts in such cases. – Torbjørn T. Sep 30 '19 at 16:11
  • Thanks for all these amazing comments .. Yeah, sure, the second part is separated and it can be found here: https://tex.stackexchange.com/questions/510483/why-winedt-gives-a-special-color-to-the-word-gui – Sitra Oct 01 '19 at 00:51
  • You might want \ell for calligraphic small l. – Davislor Oct 01 '19 at 04:56

1 Answers1

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Math alphabets don't combine, so with

\mathfrak{\mathcal{l}}

you get exactly the same as with

\mathcal{l}

which yields a “random” symbol, because \mathcal only has effect on uppercase letters.

egreg
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