Abstract
AbstractWe study solutions of the problem urn:x-wiley:0025584X:media:mana201700226:mana201700226-math-0001where are open sets such that , , and f is a nonlinearity. Under different assumptions on f we prove that, if D0 and D1 are starshaped with respect to the same point , then the same occurs for every superlevel set of u.
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