English
For x = (a,b) in a product of monoids, the order is the least common multiple of the orders: orderOf(x) = lcm(orderOf(a), orderOf(b)).
Русский
Для пары x=(a,b) в произведении моноидов orderOf(x) = lcm(orderOf(a), orderOf(b)).
LaTeX
$$orderOf (a,b) = (orderOf a) \operatorname{lcm} (orderOf b)$$
Lean4
@[to_additive]
protected theorem orderOf (x : α × β) : orderOf x = (orderOf x.1).lcm (orderOf x.2) :=
minimalPeriod_prodMap _ _ _