GoldenFloat 4: why the split is phi

Two arguments for the phi split, and one that gives an equal split instead, read from phi_split_optimality.t27. Lesson 4 of the GoldenFloat course.

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Where the numbers come from

The lesson spec public/t27/files/specs/math/phi_split_optimality.t27, read when the course was authored; every number in the table is a constant, a test value or arithmetic of that file
Nothing on this page was measured on hardware or timed; a value written into a test is said to be written in, not computed