law rsum_at_full
import minebender-game@1.0.0.0/proof_sums.bend as ProofSumsimport Base
199law rsum_at_full:
200 for ~A: Data
201 for ~f: A -> Nat
202 for +d: A
203 for +r: List<&2, A>
204 {rsum_at(~A, ~f, d, r, List.range(List.length(&2, A, r))) == rsum(~A, ~f, r) : Nat}