[Haskell-cafe] Fixed-Point Combinators

[Adrian Neumann]

Hello,

while studying for a exam I came across this little pearl:

Y = (L L L L L L L L L L L L L L L L L L L L L L L L L L L L)
where
L = λabcdefghijklmnopqstuvwxyzr. (r (t h i s i s a f i x e d p o i n  
t c o m b i n a t o r))

posted by Cale Gibbard to this list. Now I'm wondering how exactly  
does one finde such awesome λ expressions? Is there some mathemagical  
background that lets one conjure such beasts?

Adrian
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