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• #### Square wave periodic solutions of a differential delay equation ﻿

[OWP-2014-09] (Mathematisches Forschungsinstitut Oberwolfach, 2014-05-13)
We prove the existence of periodic solutions of the differential delay equation $\varepsilon\dot{x}(t) + x(t)= f(x(t-1)), \varepsilon>0$ under the assumptions that the continuous nonlinearity $f(x)$ satisfies the negative ...