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Hi there, So I'm having this strange experience using dchange and then simplify: doing this: Int(Int(F(u,v),u=abs(v-1)..(v+1)),v=0..1); PDEtools[dchange](u=sqrt(1+v^2-2*v*mu),%,[mu]); simplify(%) assuming v>0; gives the sensible answer: -(Int(v*(Int(F(mu, v)/sqrt(1+v^2-2*v*mu), mu = 1 .. -1)), v = 0 .. 1)) But if I try to simplify on the same line as the dchange: Int(Int(F(u,v),u=abs(v-1)..(v+1)),v=0..1); simplify(PDEtools[dchange](u=sqrt(1+v^2-2*v*mu),%,[mu])) assuming v>0; i get -v*(Int(Int(F(mu, v, v)/sqrt(1+v^2-2*v*mu), mu = 1 .. -1), v = 0 .. 1)) I.e., the v has popped outside the v-integral, which is obviously wrong... any thoughts? I'm using Maple 11 on a Mac. Many thanks in advance Chris
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