2 problems

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Nonconverse to additive periodicity of matrix rings
Nonconverse conjecture. Additive periodicity of ${\rm M}_n(R)$ does not imply additive periodicity of $R$ .
Conjectureopenmatrix-rings periodic-rings ring-theoryarXiv posted 2 days ago
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Conjecture on periodic matrix rings over semi-perfect rings
Periodic matrix-ring conjecture. If $R$ is a periodic semi-perfect ring, then the matrix ring
Conjecturesolvedmatrix-rings periodic-rings ring-theoryarXiv posted 2 days ago

Nonconverse to additive periodicity of matrix rings