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Why can't Mathematica simplify this?

• To: mathgroup at smc.vnet.net
• Subject: [mg85010] Why can't Mathematica simplify this?
• From: dudesinmexico at gmail.com
• Date: Tue, 22 Jan 2008 05:40:04 -0500 (EST)

I think that Mathematica should be able to simplify this, since N and
and l
are constrained to be Integers:

Simplify[Sin[2 Pi l (N - 1) /N], {N, l} \[Element] Integers]

Instead, I get the same expression

Sin[(2 l (-1 + N) Pi)/N]

Does anyone know why?

Thanks

• Follow-Ups:
  • Re: Why can't Mathematica simplify this?
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>