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Start Over Subject multifunction

1. On multifunctions with closed graphs

Creator:
Holý, D.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
upper semicontinuity, multifunction, closed graph, c-upper semicontinuity, and complete uniform space
Language:
English
Description:
The set of points of upper semicontinuity of multi-valued mappings with a closed graph is studied. A topology on the space of multi-valued mappings with a closed graph is introduced.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

2. Periodic problems and problems with discontinuities for nonlinear parabolic equations

Creator:
Cardinali, Tiziana and Papageorgiou, Nikolaos S.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
pseudomonotone operator, $L$-pseudomonotonicity, operator of type $(S)_{+}$, operator of type $L$-$(S)_{+}$, coercive operator, surjective operator, evolution triple, compact embedding, multifunction, upper solution, lower solution, extremal solution, and $R_{\delta }$-set
Language:
English
Description:
In this paper we study nonlinear parabolic equations using the method of upper and lower solutions. Using truncation and penalization techniques and results from the theory of operators of monotone type, we prove the existence of a periodic solution between an upper and a lower solution. Then with some monotonicity conditions we prove the existence of extremal solutions in the order interval defined by an upper and a lower solution. Finally we consider problems with discontinuities and we show that their solution set is a compact $R_{\delta }$-set in $(CT,L^2(Z))$.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public