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Reference.org
Deviation of a local ring
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<p>In <a href="/facts/Commutative_algebra/mKtUdPCT">commutative algebra</a>, the deviations of a local ring <i>R</i> are certain <a href="/facts/Invariant_(mathematics)/9TeNN2ed">invariants</a> ε<i>i</i>(<i>R</i>) that measure how far the <a href="/facts/Ring_(mathematics)/JnCUXz63">ring</a> is from being <a href="/facts/Regular_ring/P9s5Fvrl">regular</a>. </p>