Daniel Fischer <[EMAIL PROTECTED]> 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, denying its existence there (by defining all units to be non-prime) and then calling the whole algebra paradox-free, hoping that noone notices.
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