English
Same as the previous min‑mul‑min, presented as a simplification.
Русский
То же, что и в предыдущем, оформленное как упрощение.
LaTeX
$$mulAntidiagonal_min_mul_min ...$$
Lean4
/-- The image of a binary function `f : α → β → γ` as a function `Finset α → Finset β → Finset γ`.
Mathematically this should be thought of as the image of the corresponding function `α × β → γ`. -/
def image₂ (f : α → β → γ) (s : Finset α) (t : Finset β) : Finset γ :=
(s ×ˢ t).image <| uncurry f