8 Jun
2012
8 Jun
'12
3:07 a.m.
My formula is:
R = -ia'bc/(4 A)
where i=sqrt(-1), and a' is conjugate(a).
The left hand side should be the position vector of A with respect to O, not R. (They are only equal when this vector is real.) Your webpage is correct, however. Sincerely, Adam P. Goucher