| ⊦ v ∈ avols ∧ m < # avols[v] ∧ avols[v][m] = mapped(buf, m0) ∧ ebm-cons(avols) → (is-aligned(m0 + m1, EB_PAGE_SIZE) ↔ is-aligned(m1, EB_PAGE_SIZE)) |
avols[v][m] = mapped(buf, m0), m < # avols[v], ebm-cons(avols), v ∈ avols ⊦ is-aligned(m0 + m1, EB_PAGE_SIZE) ↔ is-aligned(m1, EB_PAGE_SIZE)