Multiplicity results for sign changing bound state solutions of a semilinear equation

In this paper we give conditions on $f$ so that problem $Δu +f(u)=0,\quad x\in \mathbb{R}^N, N\ge 2,$ has at least two radial bound state solutions with any prescribed number of zeros, and such that $u(0)$ belongs to a specific subinterval of $(0,\infty)$. This property will allow us to give conditions on $f$ so that this problem has at least any given number of radial solutions having a prescribed number of zeros.

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