Mathematics, 08.10.2020 02:01 Davynsurfsoccergirl
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1.) The Zero Divisor Theorem. If {\displaystyle M\neq 0}{\displaystyle M\neq 0} has finite projective dimension and {\displaystyle r\in R}r\in R is not a zero divisor on {\displaystyle M}M, then {\displaystyle r}r is not a zero divisor on {\displaystyle R}R.
2.)Bass's Question. If {\displaystyle M\neq 0}{\displaystyle M\neq 0} has a finite injective resolution then {\displaystyle R}R is a Cohen–Macaulay ring.
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