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The formula currently used to calculate the solutions of the equation
alpha*lam**3 + beta*lam*2*mu + gamma*lam*mu**2 + delta*mu**3 = 0
doesn't seem to work. It is based on the book Perspectives on Projective Geometry (page 198). We can replace that calculation with the simpler calculation of roots of the same equation withmu = 1
.This should solve #36.