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By Ian W. Knowles, Roger T. Lewis

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Extra resources for Differential Equations: Conference Proceedings

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1: If uo is r a d i a l then ( s -AV Suppose t h a t uo(x) = f ( 1x1) and t h a t B c2 > c1 z 0. Then f o r any r z 0 uo is ) and ( s - A V ) a r e equivalent and n ( s -AVB) holds. is the In f a c t we have ; g ( s ) = a,(s). Proof: uo 2 0 Fix we have by a change o f v a r i a b l e s : The Porous Medium Equation in RN Jcc2 ITN-s f(ra)aN-ldo Thus a p p l y i n g ( s -AVB) Now t a k e a in cp in we obtain N CO(R ) and f o r s i m p l i c i t y assume t h a t it i s s u p p o r t e d For a n a r b i t r a r y p o s i t i v e i n t e g e r B1(0).

In Lp(IRn). 2. We state some of these results in Let H DCH) = {u: UE HU Then Ao(P) E uess(H). P in L2(lRn) be the realization of = defined by L ~ ( R ~ )n H:~~(R~), P ~ LE2(Rn ) I PU u E D(H). for Moreover AO(P) = inf Re u ess (H). Let $(x) such that be an eigenfunction of Rev < Ao(P). Then [$(x)I where px eigenfunction 4. 1), C eigenvalue p with $(x) H with a (possibly complex) eigenvalue Rep

K*) an ( P - x ) ~= be t h e convex body i n lRn X Theorem 2 . 2 ) . Then K x K; = - o (resp. such t h a t aK . c i n t KX f o r X < 1-1 5 A u o KA = { < 1 (a s i n g l e p o i n t ) and (ii) For any X 5 A denote by 'a 5 i s t h e exponent of some p o s i t i v e (P*-x)~= 0 ) . = rh(resp. Let * * 3KX =Ti) K~ (by i s a continuous set valued f u n c t i o n of 1 such t h a t (i) K (iii) and i f A > A. such t h a t I R ~ of if A 5 A Rn K-_ = IR" KX. * It follows from t h e l a s t theorem t h a t i f P = P then K, i s s m e t r i c It is c o n v e n i h t o introduce w i t h r e s p e c t t o t h e o r i g i n and t h a t KA = CO}.

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