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Jul 6, 2010 at 16:09 comment added Jim Humphreys This further look back into history is a good reminder of how irrational the development of notation has been in mathematics. Still, someone must have been first to use (and maybe rationalize) the symbol $\ell$ in the way indicated. It might have been Weil, so maybe I will give his collected papers a try when I get courageous.
Jul 6, 2010 at 14:08 history edited quim CC BY-SA 2.5
added 96 characters in body
Jul 6, 2010 at 12:06 history answered quim CC BY-SA 2.5