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Real-valued functions of real variable, analytic properties of functions and sequences, limits, continuity, smoothness of these.

4 votes
1 answer
312 views

On convex functions which are non constant on every segment

I have been studying for the last few weeks the paper Dirichlet problem for demi-coercive functionals by Anzellotti, Buttazzo and Dal Maso. In this work the authors introduced and studied the variatio …
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  • 391
5 votes
3 answers
604 views

Uniqueness of minimizers in a problem in the Calculus of Variations - Part II

Take any convex set $A\subset\mathbb{R}^n$ which contains a neighborhood of the origin and let $f_A$ be the associated Minkowski functional $$ f_A(x) = \inf\{\lambda>0\mid x\in\lambda A\}, $$ which tu …
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  • 391
4 votes

Textbook recommendation request: Exercises to supplement Evans and Gariepy

Concerning Geometric measure theory and BV functions, I would recommend Functions of Bounded Variation and Free Discontinuity Problems (by Luigi Ambrosio, Nicola Fusco, and Diego Pallara), Oxford Math …
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  • 391
3 votes
2 answers
214 views

Example of convex functions fulfilling a (strange) lower bound

I am reading a preliminary version of a paper which focuses on some minimization problems connected to a class of integral functionals. Reading the assumptions of one of the theorems I cannot convince …
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  • 391
3 votes
1 answer
215 views

Uniqueness of minimizers in the Calculus of Variations

Let $f \colon \mathbb R^2 \to \mathbb R$ be the function defined by $$ f(x,y):= (x^+)^2 + (y^+)^2 $$ where $a^+ = \max\{a,0\}$ for any real number $a$. Given a Lipschitz regular domain $\Omega \sub …
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  • 391
4 votes
1 answer
178 views

Non-linear translation invariant functionals on $L^1$

I have recently come across a class of (possibly non-linear) operators $F$ defined on $L^1$ such that $F \colon L^1(\mathbb R^d) \to \mathbb [0,+\infty]$; $F(u(\cdot - z)) = F(u(\cdot))$ for every …
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  • 391
6 votes
1 answer
212 views

A one-dimensional integral minimization problem

Let $\mathscr F$ be the collection of smooth functions $f \colon \mathbb R \to \mathbb R$ such that $f \in C^\infty_c(\mathbb R)$, with $\text{supp } f \subset [-1,1]$; $\int_0^1 x f(x) …
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  • 391
3 votes
1 answer
170 views

Infimum of an integral functional involving a symmetric matrix

I have a symmetric $d \times d$ matrix $A$ and I have the following functional: $$ \mathcal J(h) := \int_{B_1(0)} \vert \langle Au,u \rangle\vert \frac{\vert h'(\vert u \vert)\vert}{\vert u \vert} du, …
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  • 391
10 votes
1 answer
486 views

Does this Osgood-like condition imply continuity?

Let us consider a bounded, Borel function $F\colon \mathbb R^d \to \mathbb R^d$. Assume it satisfies the following Osgood-like condition: $$\tag{O} \boxed{\vert \langle F(x) - F(y), x-y \rangle\ver …
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  • 391