English
Two subalgebras A and B are linearly disjoint over R if their underlying submodules are linearly disjoint.
Русский
Две подалгебры A и B линейно дизонтриваются по R, если их соответствующие подмодули линейно дизонтриваются.
LaTeX
$$$A \text{ LinearDisjoint } B \iff (\operatorname{toSubmodule} A) \; \text{LinearDisjoint} \; (\operatorname{toSubmodule} B)$$$
Lean4
/-- If `A` and `B` are subalgebras of `S / R`,
then `A` and `B` are linearly disjoint, if they are linearly disjoint as submodules of `S`. -/
protected abbrev LinearDisjoint : Prop :=
(toSubmodule A).LinearDisjoint (toSubmodule B)