I was looking at the Theory of Facility for the spreadsheet. At the risk of looking dumb, I request that someone look at the equations. The second page shows the illustrations upside down. We can work with that. The first equation below the illustrations is fundamental to the rest of the paper. The term (b^2 – a^2) on the left side of the equation is changed to (c^2 – 1)a^2 on the right side of the equation. That doesn’t look right to me. I drew a diagram and substituted numbers in the terms and the results are not the same.
