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Wright type delay differential equations with negative Schwarzian

E. Liz·M. Pinto·G. Robledo·V. Tkachenko·S. Trofimchuk
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Abstract

We prove that the well-known 3/2 stability condition established for the Wright equation (WE) still holds if the nonlinearity $p(\exp(-x)-1)$ in WE is replaced by a decreasing or unimodal smooth function f with $f'(0)<0$ satisfying the standard negative feedback and below boundedness conditions and having everywhere negative Schwarz derivative.

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E. Liz, M. Pinto, G. Robledo, V. Tkachenko, S. Trofimchuk. 2002-03-05. Wright type delay differential equations with negative Schwarzian. https://arxiv.org/abs/math/0111285

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