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Multiple symmetric positive solutions for discrete Lidstone boundary value problems. (English) Zbl 0969.39003
The difference equation $(-1)^m\Delta^{2m} y(t-m)= f\bigl(y(t) \bigr), \quad t\in \{1,2, \dots, T+1\}$ is considered subject to $$\Delta^{2i} y(-m+1)=0$$, $$0\leq i\leq m-1$$, and $$\Delta^{2j} y(T+m+1-2j)=0$$, $$0\leq j\leq m-1$$. Under certain growth conditions for the positive function $$f$$ the existence of at least three symmetric positive solutions is proved by means of a fixed point theorem due to R. W. Leggett and L. R. Williams [Indiana Univ. Math. J. 28, 673-688 (1979; Zbl 0421.47033)].

##### MSC:
 39A11 Stability of difference equations (MSC2000)
Zbl 0421.47033