English
If β is a Semiring with a strict order (IsStrictOrderedRing), then Germ β is a IsStrictOrderedRing.
Русский
Если β — строгопорядковое кольцо (IsStrictOrderedRing), то Germ β — тоже строго упорядченное кольцо.
LaTeX
$$$\\text{IsStrictOrderedRing}(β, \\le) \\Rightarrow \\text{IsStrictOrderedRing}(β^*, \\le).$$$
Lean4
instance instIsStrictOrderedRing [Semiring β] [PartialOrder β] [IsStrictOrderedRing β] : IsStrictOrderedRing β*
where
mul_lt_mul_of_pos_left x y
z :=
inductionOn₃ x y z fun _f _g _h hfg hh ↦
coe_lt.2 <| (coe_lt.1 hh).mp <| (coe_lt.1 hfg).mono fun _a ↦ mul_lt_mul_of_pos_left
mul_lt_mul_of_pos_right x y
z :=
inductionOn₃ x y z fun _f _g _h hfg hh ↦
coe_lt.2 <| (coe_lt.1 hh).mp <| (coe_lt.1 hfg).mono fun _a ↦ mul_lt_mul_of_pos_right