| ⊦ ¬ v ∈ vols ∧ abs○(avols, apebs, vols, q, v) → abs(avols[v, fill(mkabstractvolume(n), erased)], apebs, vols[v, fill(mkebatbl(n), unmapped)], q - v) |
abs○(avols, apebs, vols, q, v) ⊦ abs(avols[v, fill(mkabstractvolume(n), erased)], apebs, vols[v, fill(mkebatbl(n), unmapped)], q - v), v ∈ vols