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Search options not deleted user 111925

This tag is used if a reference is needed in a paper or textbook on a specific result.

2 votes
1 answer
295 views

Is there a name for the space of gradients?

Let $\Omega \subseteq \mathbb{R}^n$ be a bounded domain. Define the set $$H = \left\{\nabla f : f \in \mathcal{C}^1(\Omega)\right\}.$$ I suspect that $H$ is a Hilbert space (though I am unsure about c …
2 votes
1 answer
396 views

Second-order elliptic regularity with rough coefficients

Let $\Omega \subseteq \mathbb R^n$ be a bounded open set with smooth boundary. Let $k\geq 1$, $\alpha\in(0,1)$, $a_{ij},b_i,f \in C^{k,\alpha}(\Omega)$ for $i,j=1,...,n$, and define the operator $$L = …