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Re: Rule replacement doesn't work after NDSolve?
Thank you. Great example. I see that the FullForm[-2*I] is also not Times[Complex[-2,0],Complex[0,1]]. So this won't work either: -2*I/.Complex[0,1]->Complex[0,-1] to replace only I with -I, we need to use parentheses: -2*(I/.I->-I) Not very pretty, and it seems to get worse very quickly: 1-2*(I/.I->-I) or 2*(I/.I->-I)*Exp[2*(I/.I->-I)] It seems that every replacement of I with -I must be specified separately. Uuugly!