15 resultados para Riemann, superfici, genere, curve

em Bulgarian Digital Mathematics Library at IMI-BAS


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∗ This research is partially supported by the Bulgarian National Science Fund under contract MM-403/9

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We define Picard cycles on each smooth three-sheeted Galois cover C of the Riemann sphere. The moduli space of all these algebraic curves is a nice Shimura surface, namely a symmetric quotient of the projective plane uniformized by the complex two-dimensional unit ball. We show that all Picard cycles on C form a simple orbit of the Picard modular group of Eisenstein numbers. The proof uses a special surface classification in connection with the uniformization of a classical Picard-Fuchs system. It yields an explicit symplectic representation of the braid groups (coloured or not) of four strings.

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Recognition of the object contours in the image as sequences of digital straight segments and/or digital curve arcs is considered in this article. The definitions of digital straight segments and of digital curve arcs are proposed. The methods and programs to recognize the object contours are represented. The algorithm to recognize the digital straight segments is formulated in terms of the growing pyramidal networks taking into account the conceptual model of memory and identification (Rabinovich [4]).

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* Work is partially supported by the Lithuanian State Science and Studies Foundation.

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2000 Mathematics Subject Classification: 33D60, 26A33, 33C60

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2000 Mathematics Subject Classification: 35A15, 44A15, 26A33

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Mathematics Subject Classification: 42A38, 42C40, 33D15, 33D60

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AMS Subject Classification 2010: 11M26, 33C45, 42A38.

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2000 Mathematics Subject Classification: Primary 14H55; Secondary 14H30, 14H40, 20M14.

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Riemann’s memoir is devoted to the function π(x) defined as the number of prime numbers less or equal to the real and positive number x. This is really the fact, but the “main role” in it is played by the already mentioned zeta-function.

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2010 Mathematics Subject Classification: 35Q15, 31A25, 37K10, 35Q58.

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2000 Mathematics Subject Classification: 14Q05, 14Q15, 14R20, 14D22.

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In the proof of Lemma 3.1 in [1] we need to show that we may take the two points p and q with p ≠ q such that p+q+(b-2)g21(C′)∼2(q1+… +qb-1) where q1,…,qb-1 are points of C′, but in the paper [1] we did not show that p ≠ q. Moreover, we hadn't been able to prove this using the method of our paper [1]. So we must add some more assumption to Lemma 3.1 and rewrite the statements of our paper after Lemma 3.1. The following is the correct version of Lemma 3.1 in [1] with its proof.

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2000 Mathematics Subject Classification: Primary 14H55; Secondary 14H30, 14J26.