English
If x = (a,b) is minimal, then b is minimal in the second coordinate.
Русский
Если x = (a,b) минимален, то b минимален во второй координате.
LaTeX
$$$\\forall {\\alpha : Type*} {\\beta : Type*} [Preorder \\alpha] [Preorder \\beta] {x : \\Prod \\alpha \\beta}, IsMin x \\rightarrow IsMin x.2$$$
Lean4
theorem snd (hx : IsMin x) : IsMin x.2 := fun c hc => (hx <| show (x.1, c) ≤ x from (and_iff_right le_rfl).2 hc).2