[Haskell-cafe] Re: Why 'round' does not just round numbers ?
barsoap at web.de
Mon Oct 27 08:34:33 EDT 2008
Daniel Fischer <daniel.is.fischer at web.de> wrote:
> Am Montag, 27. Oktober 2008 12:35 schrieb Achim Schneider:
> > Daniel Fischer <daniel.is.fischer at web.de> 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.
Then chase it out of your prime factor products. You'd be the first one
to break a monoid and locate unsafeCalculate#.
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