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Strong continuity of the relative rearrangement maps and application to a Galerkin approach for nonlocal problems

✍ Scribed by J.M. Rakotoson


Book ID
103925825
Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
142 KB
Volume
8
Category
Article
ISSN
0893-9659

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✦ Synopsis


We study the strong continuity of the map u ~-+ (b.u, b.u(I u > u(.)l) ). Here, b.u = -~a ,w(a) = .f{u>u.(a)} +fo-JU>u*(a)l(bl{ .... (a)}).(r) dT for a El0, means g~[, u. (respectively, (bl{u=u.(a)}).) denotes the decreasing rearrangement of u (respectively b restricted to the set {u -u.(a)}) and IEI denotes the Lebesgue measure of a set E included in a domain ft. The results are useful for solving plasmas physics equations or any nonlocal problems involving the monotone rearrangement, its inverse or its derivatives. Keywords--Relative rearrangement, Monotone rearrangement, Galerkin method. MAIN RESULTS If we want to solve the problem: find u in H~(~) (~ open bounded set of R N) satisfying -Au = g(u~.(I u > u(x)l), b.u(lu > u(x)l)) + f(x) and use a Galerkin approximation then we will be led to consider a sequence of finite dimension spaces Vm and solve: find Um C Vm, [Turn ;Β’] = 0,


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