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

[Neil Mitchell]

Hi,

> 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
integers!

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

Thanks

Neil