Proposal: Num instance for tuples

Dan Doel dan.doel at
Thu Oct 18 14:57:33 CEST 2012

On Thu, Oct 18, 2012 at 7:34 AM, Edward Kmett <ekmett at> wrote:
> Unlike the rest of the comments so far, I am
> +1
> to this proposal.
> It has the only reasonable semantics.

There are at least two reasonable choices. The first is this. The
second is given by the fact that for any Num a and Applicative f, we
can write Num (f a) by lifting all the operations.

I suppose the one proposed here might be more commonly used.

-- Dan

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