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Original Message (ID '130472') By Peter Pein:
In Response To 'Re: Factoring expression with diracdelta' --------- oops - a typo... the DiracDelta[y] on the right hand side of the rule should be a DiracDelta[w]. expr //. v_.*DiracDelta[w_] DiracDelta[x_] + y_.*DiracDelta[w_] DiracDelta[x_] -> (v + y)* DiracDelta[w] DiracDelta[x]