Another bug, I think
While this is fresh in my mind I thought I'd post it.
p222, at the bottom, in the fourth line of equations to calculate the value of g, you lose a factor of (x_1)^2 somewhere.
When I solve
g = y_2(x_1 - y_2) - g(y_2)^2
I get g = r/6 not g = r/2. Having said that, I made so many mistakes in doing this calculation that it could well be off.
Guy.
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