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Questions on the calculus of variations, which deals with the optimization of functionals mostly defined on infinite dimensional spaces.

18 votes
4 answers
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What was Weierstrass's counterexample to the Dirichlet Principle?

Shortly after his work on the foundations of geometry David Hilbert turned his attention to finding a suitable statement of the Dirichlet principle, from which to prove the Riemann mapping theorem and …
Jeremy Shipley's user avatar