does anyone know if there's a theory for the following problem: Optimize the task

$\begin{align*} T_\phi(\tilde{u})&=\inf\limits_u T_\phi(u)\\ Au&=b\\ u&\in L^p(\Omega),\,\Omega\subset \mathbb{R}^n \end{align*}$

for (nonlinear map) $A:L^p(\Omega)\to Z$, with $Z$ arbitrary local convex topological vector space and $T_\phi:L^p(\Omega)\to \mathbb{R}\cup\{\pm\infty\}$ defined by


a weakly lower semiconinous convex function, with weakly compact level set. The map $\phi$ is also lower semiconinous convex.

Or exist there a theorem, that such a problem possess a optimal solution?

  • $\begingroup$ My idee was to use the theory of monoton operators, but the problem is that the image of $A$ is not $(L^p)^*$. $\endgroup$ – FuncAna09 Feb 11 at 11:45
  • $\begingroup$ Are there any more conditions on $A$? Without any additional conditions, you don't necessarily have minimizers. $\endgroup$ – MaoWao Feb 11 at 23:25
  • $\begingroup$ The question is what conditions must be placed on a nonlinear A for the task to have a non-trivial solution. $\endgroup$ – FuncAna09 Feb 12 at 7:44
  • $\begingroup$ If I replaced $Z$ with $(L^p)^*$ and suppose $A$ is monotonous, hemistic and coercive, then there should be a solution to the problem. This would follow from the theorem of Browder and Minty. $\endgroup$ – FuncAna09 Feb 12 at 7:50

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