Abstract

Let k be an algebraic number field of degree n on ℚ2; ℱ and ℊ, respectively, the curves on k; let , and ℴm, ℴ'm be the bases of groups of all points of order m on ℱ and g, respectively. A proof of the following theorem is sketched: let p>3 be prime; if , then τ(pt)⩽6n; if k, then τ(pt)⩽4n. The resulting bounds are unimprovable.

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