Section proofs.
Hypothesis RDC_K : RelDec_Correct RD_K.
Hypothesis Refl : Reflexive R.
Hypothesis Sym : Symmetric R.
Hypothesis Trans : Transitive R.
Definition mapsto_alist (m : alist) k v : Prop :=
alist_find k m = Some v.

Theorem mapsto_lookup_alist : forall (k : K) (v : V) (m : list (K * V)),
lookup k m = Some v <-> mapsto_alist m k v.