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Proof step 3 from proof awbuf-inv-crash (previous step)

# avol1 = # avol0, avol1[n] = mapped(buf), n < # avol0, bleb ≠ nobuffer → bleb.leb < # avol0 ∧ avol0[bleb.leb].mapped?, ∀ n. n < # avol0 ∧ avol0[n].mapped? → # avol0[n].data ≤ LEB_SIZE ∧ (buffered(n) ≠ bleb → is-aligned(# avol0[n].data, EB_PAGE_SIZE)), ∀ n. n < # avol0 → (avol0[n].mapped? → avol1[n] = mapped(subarray(avol0[n].data, 0, align↓(# avol0[n].data, EB_PAGE_SIZE)))) ∧ (¬ avol0[n].mapped? ∧ avol1[n].mapped? → # avol1[n].data ≤ LEB_SIZE ∧ is-aligned(# avol1[n].data, EB_PAGE_SIZE)) ⊦ # buf ≤ LEB_SIZE ∧ is-aligned(# buf, EB_PAGE_SIZE)

User applied rule case distinction

And obtained the following new goals

Rule argument

pos: right 1

Additional information