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We first define a function b{t} as follows: given the set of squares such that each has three corners on C and vertex at t, b{t} is the corresponding set of positive parametric differences between T and the backward corner points.

The functions F and B have exactly the same multiplicity at every argument T.

Now with P fixed at Af, Af-values occur when the corner Af crosses C, and are among the values of S such that Af.

The roots of this equation are just the ordinates of the intersections of the graph of B with a straight line of unit slope through Af in the b-plane ( the plane of the graph of b ).

We define these values as Af, and define g{t} in the same way for each T.

Thus we obtain g{t} by introducing an oblique g{t}-axis in the Aj.