English
The underlying multiset of a cons s is the same as the multiset obtained by cons on the left: (a ::ₛ s : Multiset α) = a ::ₘ s.
Русский
Мультисет подлежащий конструктору: (a ::ₛ s : Multiset α) = a ::ₘ s.
LaTeX
$$$ (a ::_s s : \mathrm{Multiset}(\alpha)) = a ::_m (s : \mathrm{Multiset}(\alpha)) $$$
Lean4
theorem coe_cons (s : Sym α n) (a : α) : (a ::ₛ s : Multiset α) = a ::ₘ s :=
rfl