English
The minimal polynomial of x over G F and over the fixed-point subfield are the same: minpoly G F x = minpoly (FixedPoints.subfield G F) x.
Русский
Минимальный полином элемента x над полями G F и над подполем фиксированных точек совпадает: minpoly G F x = minpoly (FixedPoints.subfield G F) x.
LaTeX
$$$\\minpoly G F x = \\minpoly( FixedPoints.subfield G F ) x$$$
Lean4
theorem minpoly_eq_minpoly : minpoly G F x = _root_.minpoly (FixedPoints.subfield G F) x :=
minpoly.eq_of_irreducible_of_monic (minpoly.irreducible G F x) (minpoly.eval₂ G F x) (minpoly.monic G F x)