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On p -adic zeros of systems of diagonal forms restricted by a congruence condition

Hemar Godhino, Paulo H. A. Rodrigues (2007)

Journal de Théorie des Nombres de Bordeaux

This paper is concerned with non-trivial solvability in p -adic integers of systems of additive forms. Assuming that the congruence equation a x k + b y k + c z k d ( m o d p ) has a solution with x y z 0 ( m o d p ) we have proved that any system of R additive forms of degree k with at least 2 · 3 R - 1 · k + 1 variables, has always non-trivial p -adic solutions, provided p k . The assumption of the solubility of the above congruence equation is guaranteed, for example, if p > k 4 .

On pairs of closed geodesics on hyperbolic surfaces

Nigel J. E. Pitt (1999)

Annales de l'institut Fourier

In this article we prove a trace formula for double sums over totally hyperbolic Fuchsian groups Γ . This links the intersection angles and common perpendiculars of pairs of closed geodesics on Γ / H with the inner products of squares of absolute values of eigenfunctions of the hyperbolic laplacian Δ . We then extract quantitative results about the intersection angles and common perpendiculars of these geodesics both on average and individually.

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