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**To**:**source-changes-d%NetBSD.org@localhost****Subject**:**Re: CVS commit: src/games/factor****From**:**Dennis den Brok <d.den.brok%uni-bonn.de@localhost>**- Date: Sun, 16 May 2010 16:32:24 +0000 (UTC)

On 2010-05-16, David Laight <david%l8s.co.uk@localhost> wrote: > The definition of primality gets taken from that of the positive (or > non-negative integers) and applied more generally to other mathematical > objects - in particular 'fields'. > In field theory you need a definition that applies to any field, not > just the integers. > From memory - it is a long time since I did any field theory - a field > has a single 'zero', and possibly many 'units' (I think units are > defined as values that multiplying by doesn't change the magnitude). > For the field 'Z' (all the integers) the units are 1 and -1, and > the mathematical definition of primality makes 'prime * unit' prime. Z is not a field, and in a field there are no prime elements at all. Regards, Dennis den Brok

**References**:**Re: CVS commit: src/games/factor***From:*David Laight

**Re: CVS commit: src/games/factor***From:*Martin Husemann

**Re: CVS commit: src/games/factor***From:*David Laight

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