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math.GM2008
Hurwitz's Freeness Property
Pierre-Yves Gaillard
The groupoid attached to the action of PSL(2,Z) on the irrational reals by linear fractional transformations is free.
math.GM2008
The Gauss-Dirichlet Orbit Number
Pierre-Yves Gaillard
Dirichlet computed in some particular cases the number of equivalence classes of representations of a nonzero integer by a representative system for the integral binary quadratic f…