English
The induction step leads to constructing words by appending a generator to the normal word, preserving normalization.
Русский
Индукционный шаг строит слова путём добавления генератора к нормализованному слову сохраняя нормализацию.
LaTeX
$$$\text{cons}$ constructs a new normal word by appending a generator and preserving normalization$$
Lean4
/-- The empty normalized word, representing the identity element of the group. -/
@[simps!]
def empty : NormalWord d :=
⟨CoprodI.Word.empty, 1, fun i g => by simp [CoprodI.Word.empty]⟩