Abstract
We discuss existence and multiplicity of solutions of the periodic problem for the curvature-like equation − ( u ′ / a 2 + u ′ 2 ) ′ = f ( t , u ) by means of variational techniques in the space of bounded variation functions. As a = 0 is allowed, both the prescribed curvature equation and the 1-Laplace equation are considered. We are concerned with the case where the right-hand side f of the equation interacts with the beginning of the spectrum of the 1-Laplace operator with periodic boundary conditions on [ 0 , T ] , being mainly interested in the situation where ess sup [ 0 , T ] × R f ( t , s ) may differ from − ess inf [ 0 , T ] × R f ( t , s ) .
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