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Let R be a ring. Let A be an R-algebra. A \textbf{derivation} on A is an R-linear transformation d:A\to A such that d(a.b)=d(a).b+a.d(b).
Let R be a ring. Let A be an R-algebra. A \textbf{derivation} on A is an R-linear transformation d:A\to A such that d(a.b)=d(a).b+a.d(b).