[Haskell-cafe] Proposal for restructuring Number classes

Andrew U. Frank frank at geoinfo.tuwien.ac.at
Mon Apr 10 06:13:55 EDT 2006

there has been discussions on and off indicating problems with the structure
of the number classes in the prelude. i have found a discussion paper by
mechveliani but i have not found a concrete proposal on the haskell' list of
tickets. i hope i can advance the process by making a concrete proposal for
which i attach Haskell code and a pdf giving the rational can be found at

if i have not found other contributions, i am sorry and hope to hear about

i try a conservative structure, which is more conservative than the
structure we have used here for several years (or mechveliani's proposal).
It suggests classes for units (Zeros, Ones) and CommGroup (for +, -),
OrdGroup (for abs and difference), CommRing (for *, sqr), EuclideanRing (for
gdc, lcm, quot, rem, div...) and Field (for /). I think the proposed
structure could be a foundation for mathematically strict approaches (like
mechveliani's) but still be acceptable to 'ordinary users'.

i put this proposal for discussion here and hope for suggestions how it can
be improved before i put it to haskell'!

andrew frank

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