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Displaying 21 – 40 of 152

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Real algebraic actions on projective spaces - A survey

Ted Petrie (1973)

Annales de l'institut Fourier

Let G be a compact lie group. We introduce the set S G ( Y ) for every smooth G manifold Y . It consists of equivalence classes of pair ( X , f ) where f : X Y is a G map which defines a homotopy equivalence from X to Y . Two pairs ( X i , f i ) , for i = 0 , 1 , are equivalent if there is a G homotopy equivalence φ : X 0 X 1 such that f 0 is G homotopic to f 1 φ .Properties of the set S G ( Y ) and related to the representation of G on the tangent spaces of X and Y at the fixed points. For the case G = S 1 and Y is the S 1 manifold defined by a “linear” S 1 action on complex...

Réalisations de surfaces hyperboliques complètes dans H 3

Jean-Marc Schlenker (1998)

Annales de l'institut Fourier

Soit K 0 ] - 1 , 0 [ ; chaque métrique complète à courbure K 0 sur la sphère à N 1 trous admet une unique réalisation comme métrique induite sur une surface plongée dans H 3 dont le bord à l’infini est une réunion disjointe de cercles. De manière duale, chaque métrique complète à courbure K ˜ 0 ] - , 0 [ sans géodésique fermée de longueur L 2 π se réalise de manière unique comme troisième forme fondamentale d’une surface plongée dont le bord à l’infini est une réunion de cercles.

Realization of primitive branched coverings over closed surfaces following the hurwitz approach

Semeon Bogatyi, Daciberg Gonçalves, Elena Kudryavtseva, Heiner Zieschang (2003)

Open Mathematics

Let V be a closed surface, H⊑π1(V) a subgroup of finite index l and D=[A 1,...,A m] a collection of partitions of a given number d≥2 with positive defect v(D). When does there exist a connected branched covering f:W→V of order d with branch data D and f∶W→V It has been shown by geometric arguments [4] that, for l=1 and a surface V different from the sphere and the projective plane, the corresponding branched covering exists (the data D is realizable) if and only if the data D fulfills the Hurwitz...

Currently displaying 21 – 40 of 152