pub const ZDT3_PIECES: [(f64, f64); 5];Expand description
The f₁ ranges of ZDT3’s five pieces of front. Along f₂ = 1 − √f₁ − f₁ sin(10π f₁),
a point is on the front only if f₂ is below its value at every smaller f₁: each piece
ends at a local minimum of the curve (where its slope is zero), and the next starts where
the curve, falling again, first drops below that minimum. These were solved to 40 digits
(mpmath 1.3.0’s findroot), here rounded to the nearest f64, and agree with the
ten-digit ranges published for ZDT3; the tests check each end’s equation.