[Haskell-cafe] Thoughts about redesigning "Num" type class

[Alexey Muranov]

My 2 cents: the difference of two points in an affine space is a vector, 
the sum of a point of an affine space and a vector is another point.

On Saturday, September 12, 2015 at 8:50:58 AM UTC+2, David Thomas wrote:
>
> I think we definitely want to keep subtraction separate, and maybe 
> even allow for a subtraction operation that returns a different 
> type... 
>
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