one_notMem_supportAddSubgroup — Mathlib

English

For any RingPreordering P on a commutative ring R with HasIdealSupport, 1 is not a member of the additive subgroup P.supportAddSubgroup.

Русский

Для RingPreordering P на коммутативном кольце R с условием HasIdealSupport единица не принадлежит подподгруппе P.supportAddSubgroup.

LaTeX

$$$1 \notin P.supportAddSubgroup$$$

Lean4

theorem one_notMem_supportAddSubgroup : 1 ∉ P.supportAddSubgroup := fun h => RingPreordering.neg_one_notMem P h.2

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