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bavardage/sumterms.hs

Created May 26, 2009 20:13
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sumterms.hs
sumseries f a b = sum[f n|n<-[a..b]]
data Σ a = Σ (a -> a) a a
instance (Show a, Num a, Enum a) => Show (Σ a) where
show (Σ f a b) = show $ sumseries f a b
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