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Steady states of FitzHugh-Nagumo system with non-diffusive activator and diffusive inhibitor. (English) Zbl 1429.35130

The target of the authors is a diffusion equation coupled to an ordinary differential equation with FitzHugh-Nagumo type nonlinearity. They construct continuous spatially heterogeneous steady states near, and correspondiongly far, from constant steady states. They show that these states are all unstable. They construct various types of steady states with jump discontinuities and prove that they are stable in a weak sense.

MSC:

35K57 Reaction-diffusion equations
35B36 Pattern formations in context of PDEs
35B35 Stability in context of PDEs
35Q92 PDEs in connection with biology, chemistry and other natural sciences
92C15 Developmental biology, pattern formation

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