[Haskell-cafe] What is a number. (Was: Num instances for
miguelimo38 at yandex.ru
Mon Oct 5 13:24:37 EDT 2009
And I agree that sometimes it can be suitable.
But simply "defining an instance of Num" without a single word on the
is trying to solve is not just pointless. It's something that should
not be done.
On 5 Oct 2009, at 21:06, Lennart Augustsson wrote:
> OK, "just pairs" have no arithmetic, but one way of defining
> arithmetic is to treat the pairs as complex numbers. Or as mantissa
> and exponent. Or as something else. So there's nothing wrong, IMO,
> to make pairs an instance of Num if you so desire. (Though I'd
> probably introduce a new type.)
> On Mon, Oct 5, 2009 at 6:46 PM, Miguel Mitrofanov <miguelimo38 at yandex.ru
> > wrote:
>>> "Just pairs" have no natural arithmetic upon them.
>> Exactly my point.
>>> BTW. the missing term of M.M. is DUAL NUMBERS.
>> Remembered this already. Thanks anyway.
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