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global dimension
A ring \(R\) has global dimension \(n\) iff every $M\in {}_{R}{\mathsf{Mod}} $ admits a projective resolution of length at most \(n\).
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A ring \(R\) has global dimension \(n\) iff every $M\in {}_{R}{\mathsf{Mod}} $ admits a projective resolution of length at most \(n\).
Equivalently, \(R\) is regular iff \(R\) has finite global dimension.