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The Lobachevsky function is an commonly used special function defined by an integral formula. In Milnors chapter from Thurston's notes, which have been typeset into latex and are available here: http://library.msri.org/books/gt3m/PDF/7.pdf (the definition of the function is on the first page), he uses a Cyrillic character to denote it (the first letter of Lobacheski's name, a Cyrillic El). I would like to know how this symbol was rendered, or a way to get a similar result by a simple command in math mode.

Jean Raimbault
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    With \usepackage[utf8]{inputenc} and may be loading babel with the russian language, you might be able to use \newcommand*\loba{\textnormal{л}}. I have not tried since I can't compile right now. – Manuel Apr 21 '17 at 12:40
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    You could also look at this answer. I think you would just need to change 58 to 6C. – Ian Thompson Apr 21 '17 at 12:45
  • My 5 cents: This notation isn't well-thought, the small cyrillic l is visually to close to a small greek letter pi. – Sir Cornflakes Apr 21 '17 at 12:55
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    The recipe given in Ian Thompson's comment works fine. I also agree with jknappen's remark. To get a capital L in cyrillic one can use 4C instead of 6C (the full font chart is on p. 33 of the documentation for amsfonts: ftp://ftp.ams.org/pub/tex/doc/amsfonts/amsfndoc.pdf) – Jean Raimbault Apr 21 '17 at 13:02
  • @JeanRaimbault -- since some browsers have problems reaching the ams ftp server, an alternate option is http://mirrors.ctan.org//fonts/amsfonts/doc/amsfndoc.pdf or simply texdoc amsfndoc on a tex live system. – barbara beeton Apr 21 '17 at 14:00

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