I was looking at a Beta function identity in a math physics book I have and
it said to show .
I done that OK. But....how does one prove
I know the various gamma and beta identities, but got a little stuck on
where this comes from.
I know and so forth.
I tried various ways, but failed to get it to come together.
Where is the world do those factorials come from in that beta identity. I am missing something. Probably obvious. Always is.