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註釋Abstract: "Finding uniform formalisms to represent mode switching in models of dynamical systems is a goal that has long been strived for -- not the least within the automatic control community. Here we claim that the main reason for not reaching this goal is the tendency to confound modelling and computation. We will conjecture that the level of computation, i.e. the mathematical representation, is too low a level to yield any hope for a solution. Thus, we have chosen to search the solution at the physical level of representation; here by means of the bond graph formalism. By carefully defining a new ideal bond graph switching element, we have ensured a clear distinction between the physical and computational levels