English
A word and its maximal reduction represent the same element in the free group: mk(reduce L) = mk(L).
Русский
Слово и его максимальное редуцирование представляют один и тот же элемент свободной группы: mk(reduce L) = mk(L).
LaTeX
$$$$\operatorname{mk}(\operatorname{reduce}(L)) = \operatorname{mk}(L).$$$$
Lean4
/-- A word and its maximal reduction correspond to the same element of the free group. -/
@[to_additive /-- A word and its maximal reduction correspond to the same element of the additive
free group. -/
]
theorem self : mk (reduce L) = mk L :=
reduce.exact reduce.idem