PDF-LetRbeanorderedring.AllsquaresofnonzeroelementsofRarepositive,Rhaschar
Theorem253
ProofLetPbethepositivesetcorrespondingtotheorderingonRIfa2Rnf0gtheneitheraoraisinPandsobyclosurea2a2isalsoinPthusallsquarearepositiveUsingthis112isalwayspositivesoagainbyclo
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