Convex integration with linear constraints and its applications

We study solutions of the first order partial differential inclusions of the form $\nabla u\in K$, where $u:Ω\subset\mathbb{R}^n\to\mathbb{R}^m$ and $K$ is a set of $m\times n$ real matrices, and derive a companion version to the result of {Müller and Šverák} [20], concerning a general linear constraint on the components of $\nabla u$. We then consider two applications: the vectorial eikonal equation and a $T_4$-configuration both under linear constraints.

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