#[deprecated(since="Coq 8.16", note="Use mono1W_in instead.")]
Notation mono2W_in := mono1W_in.

Lemma inj_can_sym_in_on : {homo f : x / x \in aD >-> x \in rD} -> {in aD, {on rD, cancel f & g}} -> {in rD &, {on aD &, injective g}} -> {in rD, {on aD, cancel g & f}}.