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 Apr 29 asked Showing that $\mathbb{Z}/2\mathbb{Z}[\mathbb{Z}/2\mathbb{Z}]$ is semi-simple Apr 29 asked $\mathbb{C}\otimes_\mathbb{C} \mathbb{C} \cong \mathbb{R}\otimes _\mathbb{R} \mathbb{C}$ Apr 27 comment Example of a functor on products @Niels.Remb05 why? they are not products of the same objects? Apr 27 asked Example of a functor on products Apr 24 awarded Popular Question Apr 23 awarded Popular Question Apr 21 awarded Benefactor Apr 21 comment Equivalence of Definitions of Prime Ideal in Ring without $1$. Sorry, I thought the bounty was awarded automatically when I accepted an answer, I have awarded it now. Thanks for the help! :) Apr 19 awarded Quorum Apr 19 revised Proving that $V(R^*)=V(R)-1$ edited title Apr 19 revised Proving that $V(R^*)=V(R)-1$ added 3 characters in body Apr 19 asked Proving that $V(R^*)=V(R)-1$ Apr 18 accepted Equivalence of Definitions of Prime Ideal in Ring without $1$. Apr 17 comment Equivalence of Definitions of Prime Ideal in Ring without $1$. @rschwieb Right ok, I'll have a play around with that to check that I get everything. Thanks everyone for the help! Apr 17 comment Equivalence of Definitions of Prime Ideal in Ring without $1$. @rschwieb Cool, could you possibly explain the set where we assume that $(a)^2(b)^3\subset RaRbR$? I can't see why this follows? Thanks Apr 17 comment Equivalence of Definitions of Prime Ideal in Ring without $1$. That is if $1\notin R$ then surely we do not need to have $a\in aR$ or $b\in bR$? Apr 17 comment Equivalence of Definitions of Prime Ideal in Ring without $1$. How did you conclude that $(a)^2(b)^3\subseteq RaRbR$? Apr 17 revised Can these two quotient groups be isomorphic? added 792 characters in body Apr 17 answered Can these two quotient groups be isomorphic? Apr 17 comment Equivalence of Definitions of Prime Ideal in Ring without $1$. @ah11950 It does indeed!