Abstract
The traditional method of teaching canonical transformations involves the introduction of generating functions of various types. This method obscures the underlying structure of the Hamiltonian least-action principle, and can make a straightforward concept seem arcane. In this article, I present a method for calculating canonical changes of variable in Hamiltonian mechanics using a differential approach which is much more straightforward. This method handles canonical variables directly, but also returns the correct equations of motion for non-canonical variables. It is also much more algebraic than generating functions, making it easier to present in a systematic manner.
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