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Équations elliptiques et symétrisation de Steiner. (Elliptic equations and Steiner symmetrization). (French. Abridged English version) Zbl 0795.35022
Summary: We present a new proof of comparison results via Steiner symmetrization for solutions of elliptic equations. This proof relies upon a “level sets” argument.

MSC:
35J25 Boundary value problems for second-order elliptic equations
35B05 Oscillation, zeros of solutions, mean value theorems, etc. in context of PDEs
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