Heriot-Watt Mathematics Report Series
HWM07-21, 2 Jul 2007

Self-adjoint boundary value problems on time-scales

B P Rynne and F A Davidson


Abstract

In this paper we consider a second order, Sturm-Liouville-type boundary value operator of the form $$ L u := -[p u^{\na}]^{\De} + qu, $$ on an arbitrary, bounded time-scale $\T$, for suitable functions $p,\,q$, together with suitable boundary conditions. We show that, with a suitable choice of domain, this operator can be formulated in the Hilbert space $L^2(\T_\ka)$, in such a way that the resulting operator is self-adjoint, with compact resolvent (here, `self-adjoint' means in the standard functional analytic meaning of this term). Previous discussions of operators of this, and similar, form have described them as `self-adjoint', but have not demonstrated self-adjointness in the standard functional analytic sense.

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