| ⊦ v ∈ vols ∧ m < # vols[v] ∧ vols[v][m] = ⌜n⌝ ∧ abs(avols, apebs, vols, q) → abs(avols[v, avols[v][m, unmapped]], apebs, vols[v, vols[v][m, unmapped]], q + eq-entry(n, v × m) ') |
vols[v][m] = ⌜n⌝ , m < # vols[v], abs(avols, apebs, vols, q), v ∈ vols ⊦ abs(avols[v, avols[v][m, unmapped]], apebs, vols[v, vols[v][m, unmapped]], q + eq-entry(n, v × m) ')