30 Nov
2009
30 Nov
'09
5:47 p.m.
From: http://www.haskell.org/haskellwiki/Blow_your_mind#Polynomials -- splitting in two (alternating) -- "1234567" -> ("1357", "246") -- the lazy match with ~ is necessary for efficiency, especially enabling processing of infinite lists foldr (\a ~(x,y) -> (a:y,x)) ([],[]) This works but can't find (~) operator anywhere. Please explain or site a reference. Michael