When does a dynamical system represent an Irreversible Process

R. M. Kiehn "When does a dynamical system represent an Irreversible Process" SIAM Snowbird May 1997 poster

Cartan's construction of (what Slebodzinsky coined as) the "Lie derivative" with respect to a vector field, V, acting on a 1-form, A, is described by Marsden as Cartan's Magic Formula. (J.E.Marsden & T.S. Ratiu "Introduction to Mechanics and Symmetry" Springer Verlag 1994 p. 122-127)

L(V)A = i(V)dA + d(i(V)A) = W + dU = Q

In the current context, Cartan's magic formula is recognized both as an equation of topological evolution and as a cohomological equivalent to the First Law of Thermodynamics.

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