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Dec 8, 2010 at 0:14 comment added Timothy Wagner @darji: Sorry that was a typo. It should have been $f\in P$ in the characterization. Thanks for pointing it out.
Dec 8, 2010 at 0:13 history edited Timothy Wagner CC BY-SA 2.5
edited body; edited title
Dec 7, 2010 at 23:25 comment added darij grinberg And, generally, that $f$ has no constant term? Or $f\in R$ should be $f\in P$?
Dec 7, 2010 at 23:22 comment added darij grinberg You are surely supposing $P\neq 0$ ?
Dec 7, 2010 at 19:46 history edited Timothy Wagner CC BY-SA 2.5
added 285 characters in body; edited body
Dec 7, 2010 at 19:39 history asked Timothy Wagner CC BY-SA 2.5