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Multiple Solutions for a Nonlinear Dirichlet Problem via - Mathematics

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Sketch of the Proof of Theorem A:<br />

Observe that x4 is a point of minimum of − ˆ<br />

J. Thus, dloc(∇(− ˆ<br />

J),x4) = 1<br />

and dloc(∇ ˆ<br />

J,x4) = (−1) k .<br />

In virtue of (0.7),<br />

dloc(∇J,u4) = (−1) k = 1. (0.12)<br />

MULTIPLE SOLUTIONS FOR A NONLINEAR DIRICHLET PROBLEM VIA MORSE INDEX – 33➲<br />

▲ ▲<br />

➲ ❏ ✘

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