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This paper is a contribution to the theory of monotone operators in topological vector spaces. On the one hand, we provide new results concerning topological and geometric properties of monotone operators satisfying mild continuity assumptions. In partic

We revisit the problem of monotonicity of the period function for the differential equation u'' - u + u(p) = 0 and give a simple proof of recent results of Miyamoto and Yagasaki. (C) 2016 Elsevier Ltd. All rights reserved. Keywords Author Keywords:Per