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are-this-cent-R-identical-in-the-ring-R-pleas-sir-are-you-can-help-me-

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Question Number 75952 by mhmd last updated on 21/Dec/19
are this (cent(R),+,.)identical in the ring (R,+,.) ? pleas sir are you can help me?
arethis(cent(R),+,.)identicalinthering(R,+,.)?pleassirareyoucanhelpme?
Commented by kaivan.ahmadi last updated on 21/Dec/19
if c∈centR,r∈R ⇒rcy=ryc=yrc: ∀y∈R ⇒rc∈centR
ifc∈centR,r∈R⇒rcy=ryc=yrc:∀y∈R⇒rc∈centR

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