Re: [Haskell-cafe] Re: Why 'round' does not just round numbers ?

Am Montag, 27. Oktober 2008 12:35 schrieb Achim Schneider:

Daniel Fischer wrote:

...

Am Montag, 27. Oktober 2008 11:46 schrieb Henning Thielemann:

...

I also know a didact which tells teachers that 1 has no prime decomposition. Oh, I see, she may have copied that from Wikipedia: http://en.wikipedia.org/wiki/Prime_factorisation

I can believe that makes sense to somebody who considers 0 an unnatural number, an empty product must be frightening for them.

That is just mathematical trickery and dodgery, silently defining 1 as prime by including it (even infinitely many times!) in any prime factor,

Who does such horrible things? Repeat after me: 1 is NOT a prime. Never, under no circumstances.

denying its existence there (by defining all units to be non-prime) and then calling the whole algebra paradox-free, hoping that noone notices.