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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