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oai:docta.ucm.es:20.500.14352/578512023-08-11T07:46:50Zcom_20.500.14352_14col_20.500.14352_15

Escobedo, M. Herrero, Miguel A. 2023-06-20T17:09:06Z 2023-06-20T17:09:06Z 1993 0373-3114 10.1007/BF01765854 https://hdl.handle.net/20.500.14352/57851 http://www.springerlink.com/content/n03t33288535p7t3/ http://www.springerlink.com Consider the system (S) {ut–Δu=v(p),inQ={(t,x),t>0, x∈Ω}, vt–Δv=u(q), inQ, u(0,x)=u0(x)v(0,x)=v0(x)inΩ, u(t,x)=v(t,x)=0, whent≥0, x∈∂Ω, where Ω is a bounded open domain in ℝN with smooth boundary, p and q are positive parameters, and functions u0 (x), v0(x) are continuous, nonnegative and bounded. It is easy to show that (S) has a nonnegative classical solution defined in some cylinder QT=(0,T)×Ω with T||∞. We prove here that solutions are actually unique if pq||1, or if one of the initial functions u0, v0 is different from zero when 0<pq<1. In this last case, we characterize the whole set of solutions emanating from the initial value (u0, v0)=(0,0). Every solution exists for all times if 0<pq| |1, but if pq>1, solutions may be global or blow up in finite time, according to the size of the initial value (u0,v0). metadata only access A semilinear parabolic system in a bounded domain journal article