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Multiple Solutions for a Nonlinear Dirichlet Problem via - Mathematics

Multiple Solutions for a Nonlinear Dirichlet Problem via - Mathematics

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Theorem A. If f satisfies (f1), (f2), (f3), k ≥ 4 is an even number, and all<br />

the solutions of (0.1) are nondegenerate then problem (0.1)<br />

has at least five solutions: u1 = 0, u2 > 0 in Ω, u3 < 0 in Ω, u4, and u5.<br />

Moreover,<br />

(a) m(u4,J) = k.<br />

(b) u5 changes sign, m(u5,J) is even and m(u5,J) ≤ k.<br />

MULTIPLE SOLUTIONS FOR A NONLINEAR DIRICHLET PROBLEM VIA MORSE INDEX – 10➲<br />

▲ ▲<br />

➲ ❏ ✘

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