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

12 votes
3 answers
2k views

How to get to the earliest time zone?

You are in a plane at some point on Earth. You want to be at the earliest time zone possible at the end of your flight. What is the optimal path to take? Formally, fix spherical coordinates $(\theta, …
Nate River's user avatar
  • 6,213
5 votes
1 answer
504 views

Minimiser of a certain functional

Let $f_i \in L^1 ([0, 1])$ be a sequence of functions equibounded in $L^1$ norm - that is, there exists some $M > 0$ such that $\|f_i\|_{L^1} < M$. Define the functional $F: L^1([0, 1]) \to \mathbb R$ …
Nate River's user avatar
  • 6,213
5 votes
0 answers
568 views

What is the correct $L^\infty$ limit of this strange variational problem, and what does it e...

1. On the $L^\infty$ calculus of variations: The field known as the $L^\infty$ calculus of variations is a relatively new field that concerns itself with minimising functionals involving the supremum …
Nate River's user avatar
  • 6,213
4 votes
1 answer
241 views

Does this functional admit an absolute minimizer?

This is a close relative of the following problem. Let $\Omega$ be an open, bounded subdomain of $\mathbb R^n$ with smooth boundary, and $f_i \in W^{1, \infty} (\Omega)$ a sequence of functions equibo …
Nate River's user avatar
  • 6,213
1 vote
1 answer
180 views

Lavrentiev phenomenon between $C^1$ + Lipschitz derivative and $C^2$

Denote by $\mathcal L$ the set of continuously differentiable real valued functions on $[0, 1]$ with Lipschitz continuous derivative. Does there exist a Borel measurable function $ f: [0, 1] \times \m …
Nate River's user avatar
  • 6,213