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New posts in semi-simple-rings
A problem of central simple algebras: why $(E,s,\gamma)\cong M_n(F)$ only if $\gamma$ is the norm of an element of $E$?
abstract-algebra
ring-theory
representation-theory
noncommutative-algebra
semi-simple-rings
What are the semisimple $\mathbb{Z}$-modules?
abstract-algebra
ring-theory
modules
semi-simple-rings
why is a simple ring not semisimple?
modules
semi-simple-rings
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