[Haskell-cafe] Re: map (-2) [1..5]

Neil Mitchell ndmitchell at gmail.com
Sun Sep 10 10:27:58 EDT 2006


> I think in practice this wouldn't really be an issue. When you're
> using natural numbers, you tend to be in a situation where you're
> either numbering things statically, and not doing any calculations
> with them, or you're using them as a monoid, whereby things only
> increase.

take? primes? fibs? ackermanns?

There are lots of things things were computation is performed on
natural numbers, in fact, I'd say its relatively rare to find negative

See "What About the Natural Numbers" - "Colin Runciman" - it's a good read :)



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