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Proof step 5 from proof refine-get-volume-size (previous step)

v = default-volid, ebm-cons(avols), ebm-vol-inv(abs(avols[default-volid])), default-volid ∈ avols ⊦ ⟪if v ∈ avols then n := # avols[v] else abort⟫ ⟨ebm_avol_get_volume_size#(abs(avols[default-volid]); ; n0)⟩ (n = n0)

Heuristic symbolic execution applied rule if positive right

And obtained the following new goals

Rule argument

pos: right 1

Additional information