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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 />

Let us denote by u5 this solution. Arguing as in the case in which u4<br />

changes sign, one can get the existence of u6 and u7 which are<br />

sign-changing solutions of (0.1). We have completed the proof of (b) and<br />

(d) in Theorem A.<br />

MULTIPLE SOLUTIONS FOR A NONLINEAR DIRICHLET PROBLEM VIA MORSE INDEX – 42➲<br />

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➲ ❏ ✘

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