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

3 votes
Accepted

Difference between variation and differential

I'll try to answer to your questions in their order of appearance below. How is the variation $\delta y$ different from the differential $dy$? one of the books i tried to use to understand this says …
Daniele Tampieri's user avatar
4 votes
Accepted

Functional derivatives on Banach spaces

Premise: almost (if not) all derivations below are kept at a formal level, i.e. (apart from the notes, almost) no discussion of the hypotheses needed to make the result rigorous are given. This is bec …
Daniele Tampieri's user avatar
6 votes

Almgren's mimeographed lectures notes on varifolds

This question has already an accepted answer and it was long inactive: nevertheless I find compelling to say what I just found by googling the internet. It seems that recently the IAS has started a Di …
Daniele Tampieri's user avatar
7 votes

Representing a nonlinear elliptic PDE as an energy minimization problem

As already said by Kosh, you are trying to solve an inverse problem in the calculus of variation: in its classical formulation, given a system of PDE, the problem consists in finding a functional whos …
Daniele Tampieri's user avatar
8 votes
Accepted

What happens if we consider functions of bounded variation that are not in $L^1$?

The main historical reason for which the requirement $f\in L^1$ enters in the definition of $BV$ is that functions of bounded variation (tout court) of several variables were introduced by Lamberto Ce …
Daniele Tampieri's user avatar
1 vote
Accepted

Fréchet derivative of evaluation-like functional (multivariate)

The general procedure for the identification of a Fréchet derivative is the following Calculate the functional derivative of the given functional, then verify its linearity and verify its continuity …
Daniele Tampieri's user avatar