English
The Lex-ordered relation lifts to the Colex ordering: x ≤ a in toColex corresponds to x_i ≤ a in the i-th coordinate.
Русский
Отношение x ≤ a в порядке toColex соответствует x_i ≤ a в i-й координате.
LaTeX
$$$\\mathrm{toColex}(x) \\le \\mathrm{toColex}(\\mathrm{update}(x,i,a)) \\iff x_i \\le a.$$$
Lean4
@[simp]
theorem toLex_update_le_self_iff : toLex (update x i a) ≤ toLex x ↔ a ≤ x i := by
simp_rw [le_iff_lt_or_eq, toLex_update_lt_self_iff, toLex_inj, update_eq_self_iff]