English
For f and i, the image of Ioo(a,b) under update f i equals Ioo(update f i a, update f i b).
Русский
Для f и i образ Ioo(a,b) под обновлением f i равен Ioo(update f i a, update f i b).
LaTeX
$$$$ update f i '' Ioo a b = Ioo (update f i a) (update f i b) $$$$
Lean4
theorem image_update_Ioc (f : ∀ i, α i) (i : ι) (a b : α i) :
update f i '' Ioc a b = Ioc (update f i a) (update f i b) := by
rw [← Icc_diff_left, ← Icc_diff_left, image_diff (update_injective _ _), image_singleton, image_update_Icc]