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Proof step 20 from proof crash-neutral-unmap (previous step)

# avols[v0] = # avols0[v0], m0 < # avols0[v0], m < # avols[v], ebm-cons(avols0), ebm-cons(avols), v0 ∈ avols0, v0 ∈ avols, v ∈ avols, ∀ m. m < # avols0[v0] ∧ avols[v0][m] ≠ unmapped → (avols[v0][m] = erased → avols0[v0][m] = erased) ∧ (avols[v0][m].mapped? → avols0[v0][m] = avols[v0][m]) ⊦ avols[v0][m0] = unmapped, v0 = v, (avols[v0][m0] = erased → avols0[v0][m0] = erased) ∧ (avols[v0][m0].mapped? → avols0[v0][m0] = avols[v0][m0])

User applied rule all left

And closed the goal!

Rule argument

pos: left 9 terms: m0 abort: F discard: T computed: F

Additional information

Used terms: m0