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作者:Chernov, NI
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作者:Luk, HS; Yau, SST
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作者:Colmez, P
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作者:Cordoba, D
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作者:Kleinbock, DY; Margulis, GA
摘要:We present a new approach to metric Diophantine approximation on manifolds based on the correspondence between approximation properties of numbers and orbit properties of certain flows on homogeneous spaces. This approach yields a new proof of a conjecture of Mahler, originally settled by V. G. Sprindzuk in 1964. We also prove several related hypotheses of Baker and Sprindzuk formulated in 1970s. The core of the proof is a theorem which generalizes and sharpens earlier results on nondivergence...
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作者:Epstein, CL
摘要:We study the. problem of embeddability for three dimensional CR-manifolds. Let (M, (0) partial derivative(b)) denote a compact, embeddable, strictly pseudoconvex CR-manifold and S-0 the orthogonal projection on ker (0) partial derivative(b). If (1) partial derivative(b) denotes a deformation of this CR-structure then (1) partial derivative(b) is embeddable if and only if S-0: ker(1) partial derivative(b) --> ker(0) partial derivative(b) is a Fredholm operator. We define the relative index, Ind...
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作者:Levin, G; Van Strien, S
摘要:In this paper we shall show that the Julia set of real polynomials of the form f(z) = z(l) + c(1) with l an even integer and c(1) real is either totally disconnected or locally connected. This answers a question of J. Milnor.
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作者:Bourgain, J
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作者:Gompf, RE
摘要:The topology of Stein surfaces and contact 3-manifolds is studied by means of handle decompositions. A simple characterization of homeomorphism types of Stein surfaces is obtained-they correspond to open handlebodies with all handles of index less than or equal to 2. An uncountable collection of exotic R-4's is shown to admit Stein structures. New invariants of contact S-manifolds are produced, including a complete (and computable) set of invariants for determining the homotopy class of a 2-pl...
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作者:Pacifico, MJ; Rovella, A; Viana, M
摘要:We prove that certain parametrized families of one-dimensional maps with infinitely many critical points exhibit global chaotic behavior in a persistent way: For a positive Lebesgue measure set of parameter values the map is transitive and almost every orbit has positive Lyapunov exponent. An application of these methods yields a proof of existence and even persistence of global spiral attractors for smooth flows in three dimensions, to be given in [5].