Riassunto
Let 8 be a Riemann surface of analytically finite type (9, n) with 29 2+n> O. Take two pointsP1, P2 E 8, and set 8 ,1>2= 8 \ {P1' P2}. Let PI Homeo+(8;P1,P2) be the group of all orientation preserving homeomor phismsw: 8 -+ 8 fixingP1, P2 and isotopic to the identity on 8. Denote byHomeot(8;Pb P2) the set of all elements ofHomeo+(8;P1, P2) iso topic to the identity on 8 ,P2' ThenHomeot(8;P1,P2) is a normal sub pl group ofHomeo+(8;P1,P2). We setIsot(8;P1,P2) =Homeo+(8;P1,P2)/ Homeot(8;p1, P2). The purpose of this note is to announce a result on the Nielsen Thurston-Bers type classification of an element [w] ofIsot+(8;P1,P2). We give a necessary and sufficient condition for thetypeto be hyperbolic. The condition is described in terms of properties of the pure braid [b ] w induced by [w]. Proofs will appear elsewhere. The problem considered in this note and the form ofthe solution are suggested by Kra's beautiful theorem in [6], where he treats self-maps of Riemann surfaces with one specified point. 2 TheclassificationduetoBers Let us recall the classification of elements of the mapping class group due to Bers (see Bers [1]). LetT(R) be the Teichmiiller space of a Riemann surfaceR, andMod(R) be the Teichmtiller modular group of R. Note that an orientation preserving homeomorphism w: R -+ R induces canonically an element (w) EMod(R). Denote by&.r(R)(·,.) the Teichmiiller distance onT(R). For an elementXEMod(R), we define a(x)= inf &.r(R)(r,x(r)).
Contenuti
Volume 1: Preface. 1. A central limit theorem for the Simple random walk on a crystal lattice; M. Kotani, T. Sunada. 2. Level Statistics for Quantum Hamiltonians - Some Preliminary Ideas toward Mathematical Justification of the Theory of Berry and Tabor; N. Minami. 3. Fermion process and Fredholm determinant; T. Shirai, Y. Takahashi. 4. Strong type estimation from weak type estimates for some integral operators; N. Fujii. 5. Conjugate Fourier Series and Integrals of Several Variables in the l - 1 Sense; Z. Li. 6. Admissible wavelets and Siegel domains; H. Liu. 7. Some results on a class of oscillatory Integrals; S. Lu. 8. Weighted Hardy spaces on a domain; A. Miyachi. 9. Commutators of singular integral operators on Morrey spaces with some growth functions; T. Mizuhara. 10. On generalized fractional integrals in the Orlicz spaces; E. Nakai. 11. Weak (1,1) estimates for Littlewood-Paley functions with rough kernels; S. Sato. 12. A Note on average densities of Brownian intersection measures; N.-R. Shieh. 13. Problem of integral geometry on paraboloids with perturbation; A.H. Begmatov. 14. The connection between discrete and continuous realisations of least squares method; Y.V. Chebrakov, V.V. Shmagin. 15. An Eigenvalue Problem for Analytic Functions; D.Q. Dai, M.S. Liu. 16. On quadrature formulae of hypersingular integrals; J.Y. Du, J.C. Hu. 17. Theoretical and numerical analysis of inversion of satellite remote sensing; S.-x. Huang, J. Li. 18. Optimization of vector-valued integral equations for a class; C.G. Hu, L.X. Ma. 19. Nonlinear Riemann-Hilbert problems of first order quasi-linear elliptic system; M.Z. Li. 20. The algorithm implementation of Cauchy singular integral in Daubechies wavelets on the interval; W. Lin, Q. Li. 21. Closed form solution for a hypersingular integral equation of order n + 1; X. Li. 22. Cyclically symmetric crack problems of different media II; J. Lu. 23. Linear conjugate boundary value problems for first order ordinary system of linear differential equations with singular or super singular coefficients; N. Rajabov. 24. Initial-mixed boundary value problems for parabolic equations of second order with measurable coeeficients in a higher dimensional domain; G.C. Wen. 25. Stability estimates in states-estimation for a heat process; D. Xu, M. Yamamoto. 26. Plastic zone and opening displacement for an asymmetrical fast propagating semi-infinite crack in a strip; X.-C. Yang, T.-Y. Fan. 27. Certain class of hyperanalytic Haseman boundary value problems; Y.S. Zeng. 28. On compound boundary value problems for non linear elliptic systems of first order; C. Zhao. 29. On the integral of Cauchy type and the generalized Harnack theorem for bianalytic functions; Z. Zhao. 30. The growth of spirallike mappings; H. Hamada, G. Kohr. 31. Subordination principle to functions of several complex variables; K.H. Shon, G.M. Son. 32. &rgr;-adic Nevanlinna Theory and Functional Equations; A. Boutabaa, A. Escassut. 33. Unique range sets in p-adic and complex analys
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