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Can anyone tell me where the script L in the following snippet comes from? It's not \mathcal{L}:

enter image description here

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possible duplicate of How do I find out what fonts are used in a document/picture? – Loop Space Aug 16 '12 at 8:39
up vote 4 down vote accepted

The mathrsfs package provides \mathscr for script mathematical letters, rather than redefining \mathcal:

\usepackage{mathrsfs}% http://ctan.org/pkg/mathrsfs

enter image description here

Also consider reading this entry on the UK TeX FAQ: Better script fonts for maths.

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Thanks. (I keep forgetting about the TeX FAQ. I should stop doing that.) – rogerl Aug 28 '11 at 16:42

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