By Paolo Fergola, Florinda Capone, Maurizio Gentile, Gabriele Guerriero

ISBN-10: 9812560777

ISBN-13: 9789812560773

This complaints quantity generally surveys new difficulties, tools and methods in mathematical physics. The 22 unique papers featured are of serious curiosity to varied components of utilized arithmetic. they're offered in honour of the Professor Salvatore Rionero seventieth birthday.

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Magri, F. , Bihamiltonian structures and Stackel separability. J. Geom. Phys. 33,210-228. 18. Kalnins, E. G. , Killing tensors and variable separation for Hamilton-Jacobi and Helmholtz equations. SIAM J. Math. Anal. 11, 10111026. 19. , Sulle trasformazioni delle equazioni dinamiche. Ann. di Matem. 24, 255-300. 20. , A new class of integrable N e w t o n systems. J. Nonlin. Math. Phys. 8, Supplement, 195-199. 21. , Newton Systems of Cofactor Type in Euclidean and Riemann i a n Spaces. Linkoping Studies in Sciences and Technology, 719 (2001).

25) In these circumstances, (24) would contradict the non-negative character of E ( t ) , whence one deduces non-existence of solution for times satisfying (25). For times for which there is existence of solution,(24) may be expressed as E ( t ) 2 E(0)[1- 2-'KX1V/-1/2E1/2(0)t]-2 (26) One summarizes these results in the following Theorem: Theorem 2. , but with -dufdt replacing duldt, and assuming nonnegative solutions T , U , one has non-existence of solution for times t satisfying (25), but for times for which the solution exists one has the estimate ( 2 6 ) .

This is accomplished by second order differential inequality techniques. In [4]the fundamental assumption is that the transverse diffusivity is bounded below by a given positive constant, and it is found that the cross-sectional estimate for the perturbation decays (at least) exponentially away from the two plane ends. ] 2 Steady, U n s t e a d y , and Perturbation Problems. Consider a spatial region R with smooth boundary a R . Consider T ( x ,2) satisfying (with k ( T ) denoting the diffusivity at T ,t being the time) subject to T ( x , t )= T(x) on 80 and subject to T(x, 0 ) = f ( x ) in 0.

### New Trends in Mathematical Physics: In Honour of the Salvatore Rionero 70th Birthday Proceedings of the International Meeting Naples by Paolo Fergola, Florinda Capone, Maurizio Gentile, Gabriele Guerriero

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