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math.NT2000
Bounds of ideal class numbers of real quadratic function fields
Kunpeng Wang, Xianke Zhang
The theory of continued fractions of functions is used to give lower bound for class numbers of general real quadratic function fields over $k={\b…
math.NT1998
Explicit classification for torsion subgroups of rational points of elliptic curves
Derong Qiu, Xianke Zhang
The classification of elliptic curves E over the rationals Q is studied according to their torsion subgroups E_{tors}(Q) of rational points. Explicit criteria for the classificatio…