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math.NT2007★ 3 cited
Symmetries of quadratic forms classes and of quadratic surds continued fractions. Part I: A Poincaré model for the de Sitter world
Francesca Aicardi
The problem of the classification of the indefinite binary quadratic forms with integer coefficients is solved introducing a special partition of the de Sitter world, where the coe…
math.NT2004★ 1 cited
On binary quadratic forms with semigroup property
Francesca Aicardi, Vladlen Timorin
A quadratic form f is said to have semigroup property if its values at points of the integer lattice form a semigroup under multiplication. A problem of V. Arnold is to describe al…