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<i>L</i><sub>2</sub>(<i>Σ</i>)‐regularity of the boundary to boundary operator <i>B</i><sup>∗</sup><i>L</i> for hyperbolic and Petrowski PDEs
This paper takes up and thoroughly analyzes a technical mathematical issue in PDE theory, while—as a by‐pass product—making a larger case. The technical issue is the L 2 ( Σ )‐regularity of the boundary → boundary operator B ∗ L for (multidimensional) hyperbolic and Petrowski‐type mixed PDEs problems, where L …