English
There is a canonical linear ordered group with zero structure on the range of a valuation monoid, compatible with the order coming from the value group.
Русский
Существуют естественная линейно упорядоченная группа с нулём и совместимость порядка на множество образа оценки.
LaTeX
$$$\\text{instLinearOrderedCommGroupWithZeroMrange } (v) : \\text{ LinearOrderedCommGroupWithZero } (\\mathrm{MonoidHom.mrange} v).$$$
Lean4
instance instLinearOrderedCommGroupWithZeroMrange (v : F →*₀ Γ₀) : LinearOrderedCommGroupWithZero (MonoidHom.mrange v)
where
__ : CommGroupWithZero (MonoidHom.mrange v) := inferInstance
__ : LinearOrder (MonoidHom.mrange v) := inferInstance
bot := ⟨⊥, by simp [bot_eq_zero'']⟩
bot_le a := by simp [bot_eq_zero'', ← Subtype.coe_le_coe]
zero_le_one := Subtype.coe_le_coe.mp zero_le_one
mul_le_mul_left :=
by
simp only [Subtype.forall, MonoidHom.mem_mrange, forall_exists_index, Submonoid.mk_mul_mk, Subtype.mk_le_mk,
forall_apply_eq_imp_iff]
intro a b hab c
exact mul_le_mul_left' hab (v c)