English
If x ≠ y, then ltTrichotomy x y p q r equals if x < y then p else r.
Русский
Если x ≠ y, то ltTrichotomy x y p q r равно if x < y then p else r.
LaTeX
$$$ x \\neq y \\Rightarrow ltTrichotomy(x, y, p, q, r) = \\text{if } x < y \\text{ then } p \\text{ else } r $$$
Lean4
@[deprecated lt_trichotomy (since := "2025-04-21")]
theorem ltTrichotomy_not_gt (h : ¬y < x) : ltTrichotomy x y p q r = if x < y then p else q :=
ltByCases_not_gt h