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G-subsets and G-orbits of Q(sqrt n) under action of the modular group
Real quadratic irrational number Congruences Quadratic residues Linear-fractional transformations
2010/12/10
It is well known that G = hx, y : x2 = y3 = 1i represents the modular group PSL(2,Z), where x : z → −1 z , y : z → z−1 z are linear fractional transformations. Let n = k2m, where k is any ...