h.eccoef

来自「强大的数学工具包」· ECCOEF 代码 · 共 19 行

                               * * * * * * *
                               *  eccoef   *
                               * * * * * * *

        "elliptic curve coefficient"
        SYNTAX: X = eccoef(E, l)

        E is an expression whose value is an elliptic curve of the form
                E=EC( a_1, a_2, a_3, a_4, a_6 )
        or      E=EC( a_4, a_6 ).
        l is a positive integer whose value is 1, 2, 3, 4 or 6.

        X is assigned the l-th coefficient a_l of E.


        Example 1: (correct)

                eccoef(EC(MOD(3),MOD(4),MOD(3),MOD(1),MOD(1)), 3)