       Integer Assumptions in Integrations

• To: mathgroup at smc.vnet.net
• Subject: [mg20153] Integer Assumptions in Integrations
• From: "Will Cooper" <wcooper1 at san.rr.com>
• Date: Sat, 2 Oct 1999 03:05:09 -0400
• Organization: Time Warner Cable of San Diego, CA
• Sender: owner-wri-mathgroup at wolfram.com

Hello,
How can I set a variable assumption to be an integer in an integration
calculation?

e.g. The incomplete gamma function is defined as Gamma[a,q] =
Integrate[t^(a-1)*Exp[-t], {t, q, Infinity}]

I want to set the assumption that 'a' is always an Integer.

I don't want to round 'a' to the next lowest integer, i.e.
Integrate[t^(Integer[a]-1)*Exp[-t], {t, q, Infinity}]

I just want to indicate that 'a' only assumes integer values.

Thanks for any assistance.

Will Cooper.

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