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From: Stephen Montgomery-Smith
Subject: gammainc
Date: Wed, 05 Dec 2012 19:41:11 -0600
User-agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/17.0 Thunderbird/17.0

On 12/05/2012 06:17 AM, 强哥 wrote:
> Nice to email you.Could you please instruct me that,in Matlab,why 
> gammainc(0,0)=0,in detail,how we can get the expression of x^a?I'm expecting 
> your reply sincerely.

I presume you are looking at:

If x is small, then in the integrand in the first displayed equation,
e^t is approximately 1.  So the integral computes to approximately
x^a / (a gamma(a)) = x^a / gamma(a+1)

Since a is small, gamma(a+1) is approximately gamma(1) = 1.

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