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This question already has an answer here:

It's very common to use L_{1} as norm symbol. But it doesn't look like as nice as "ℓ 1". I'm wondering how can I get "ℓ1" using Latex.

marked as duplicate by Peter Grill, Svend Tveskæg, karlkoeller, yo', cmhughes Feb 11 '14 at 18:34

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    try \ell. i wonder if this is a duplicate of another question... – cmhughes Feb 11 '14 at 18:10
  • @cmhughes: Sure appears to be... – Peter Grill Feb 11 '14 at 18:18

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