h.classnum

来自「强大的数学工具包」· CLASSNUM 代码 · 共 37 行

                         * * * * * * *
                         * classnum  *
                         * * * * * * *

        "class number"
        SYNTAX: X = classnum(D)
                X = classnum(Nf)
                X = classnum()

        D is a nonzero integer equal to 0 or 1 mod 4. Nf is the current 
        number field. In the second and the third case, the current number
        field must be a quadratic number field and D is the discriminant 
        of this number field.

        X is assigned the class number of the quadratic number field 
        Q(sqrt(D)).

        Example 1: (correct)

                classnum(5)


        Example 2: (correct)

                classnum(curNumberField)


        Example 3: (correct)

                classnum()

        Example 4: (incorrect)

                classnum(6)

_ERR_NR_003