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Talk:Identity function

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This is an old revision of this page, as edited by Bo Jacoby (talk | contribs) at 10:43, 12 October 2005. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

I changed back to the previous version for the following reasons:

  • The identity function is in general not multiplicative. Only in the special case of M = positive integers could it be called a multiplicative function. But there are many other sets M out there.
  • We don't use colors in formulas
  • Blackboard bold is reserved for sets of numbers, like R or C. Letters that stand for functions, sets or variables are normally written in italic.

AxelBoldt, Thursday, April 18, 2002

I gave the notation 1M and a reference. Who uses the notation idM ? Multiplication by one is not restricted to positive integers but apply to any group. Bo Jacoby 10:43, 12 October 2005 (UTC)[reply]

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