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Add a FIXME about the Banach laws. #21

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Sep 10, 2015
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Add a FIXME about the Banach laws. #21

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6 changes: 6 additions & 0 deletions src/SubHask/Algebra.hs
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Expand Up @@ -2118,6 +2118,12 @@ class (VectorSpace v, Normed v, Metric v) => Banach v where
normalize :: v -> v
normalize v = v ./ size v

-- | These laws correspond to the actual math class, but they don't
-- actually hold for 'Float' and 'Double'.
--
-- FIXME:
-- Find a way to actually test these laws and add them to
-- "SubHask.TemplateHaskell.Test".
law_Banach_distance :: Banach v => v -> v -> Logic (Scalar v)
law_Banach_distance v1 v2 = size (v1 - v2) == distance v1 v2

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