| #### D.12.2.9 jOft Procedure from library `atkins.lib` (see atkins_lib). Usage: jOft(t,k); Return: the j-invariant of t Assume: t is a complex number with positive imaginary part Note: k describes the number of summands being calculated in the power series, 10*k is input for the procedure `expo` Example:
    LIB "atkins.lib";
    ring r = (complex,30,i),x,dp;
    number t=(-7+i*sqr(7,250))/2;
    jOft(t,50);
    ==> -3375

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