Section TBLatticeTheory.
Context {disp : unit} {L : tbLatticeType disp}.
Implicit Types (I : finType) (T : eqType) (x y : L).
Local Notation "1" := top.
Hint Resolve le0x lex1 : core.

Lemma disjoint_lexUr z x y : x `&` z = 0 -> (x <= z `|` y) = (x <= y).