fixed point

Song Li lisong@iastate.edu
Mon, 15 Oct 2001 12:01:32 -0500 

Hi,
     anybody can explain how Y combinator work in find fixed point ? say
:

Y = 'lam' f . ('lam' x . f(xx))('lam' x . f(xx))

X = Y F -> ( 'lam' x .F(xx))('lam' x . F(xx))
               -> F(('lam'  x . F(xx))('lam' x . F(xx)))         <- How
can this expression be derived ????????????
               ->F
X
<- And why ?
    Thanks a lot!

Song