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Math Help - Rewriting a formula with beta and gammaln

  1. #1
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    Rewriting a formula with beta and gammaln

    Hi there,

    In the attached file, I've included a formula with beta and gammaln which has been rewritten for easier implementation in Excel. I get most of the rewriting, however I don't understand how multiplying A1, A2 and A4 yields the second part of the formula (the part after the + sign). Could anyone please help me with this? Any help would be much appreciated!
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  2. #2
    MHF Contributor matheagle's Avatar
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    sry, I don't do word
    I haven't paid for it, so I can't even open this up
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  3. #3
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    Hi,

    I've added the formulas as a JPG file. Are you able to open this?
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  4. #4
    MHF Contributor matheagle's Avatar
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    without writing out your equations
    I would venture to say that you need to

    1 rewrite the B(a,b) as  {\Gamma(a)\Gamma(b)\over \Gamma(a+b)}
    and use

    2  \Gamma(a+1)=a\Gamma(a) which is just integration by parts
    Last edited by matheagle; April 1st 2010 at 09:40 AM.
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