58cda30f-2a95-41c9-a67e-9ae59ef18d17 6 4 5 decimal

&[DATE] &[TIME] - &[FILENAME]

x y f 22 x * + 2 y * + x 2^- y 2^- :

11 f 4

f f

x y f 22 x * + 2 y * + x 2^- y 2^- :

we can determine ONE of the conditions 00 f 2

undetermined condition
undetermined condition f x y f 3 - 0 ≡ x y f 2 - 0 ≡ 21 mat :

balance
Guesses x.0 x 1.25 ≡ y 0.75 ≡ 21 mat :

Accuracy ε 1015 -^:

most robust for this example L f x.0 ε LevenbergMarquardt :

L 1.866 0.134 21 mat

L 1 el L 2 el + 2 / 1.000000000000010

x L 1 el L 2 el + 2 / :

y x :

sanity 22 x * + 2 y * + x 2^- y 2^- : 4.000000000000000

unknown condition
determined condition f x y f 3 - 0 ≡ 00 f 2 - 0 ≡ 21 mat :

works as well