English
CauSeq β abv carries an additive group structure, defined pointwise, compatible with the underlying sequence operations.
Русский
CauSeq β abv обладает структурой аддитивной группы, определяемой по координатам и совместимой с операциями последовательности.
LaTeX
$$$$ \mathrm{CauSeq} \\, β \\, abv \text{ is an additive group under pointwise operations.} $$$$
Lean4
instance addGroup : AddGroup (CauSeq β abv) :=
Function.Injective.addGroup Subtype.val Subtype.val_injective rfl coe_add coe_neg coe_sub (fun _ _ => coe_smul _ _)
fun _ _ => coe_smul _ _