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On symmetrizations in parabolic equations. (English) Zbl 0331.35036


MSC:

35K20 Initial-boundary value problems for second-order parabolic equations
35B05 Oscillation, zeros of solutions, mean value theorems, etc. in context of PDEs
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References:

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[11] L. E. Payne,Some isoperimetrie inequalities in the torsion problem for multiply connected regions, inStudies in Mathematical Analysis and Related Topics : Essays in Honor of G. Polya, Stanford, 1962.
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