JustinThanks,When I try to run this, I get an error saying "ValueError: setting an array element with a sequence". Am I not doing something correctly or is it simply not possible to do include u into an Expression?alpha = Expression("exp(Beta*solution)",Beta=Betasolution=u)Say I have the following:Hi all,As the title states, can a Function solution be used in an Expression?beta = 0.001u = Function(Q)