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Proof step 3 from proof inv-sync-device (previous step)

ebm-vol-inv(avol) ⊦ ⟪choose err0 with ⌊err0⌋ ∨ err0 = ESUCCESS in err := err0⟫ true

Heuristic symbolic execution applied rule choose right

And obtained the following new goals

Proof step 4:
ebm-vol-inv(avol), ⌊err0⌋ ∨ err0 = ESUCCESS ⊦ ⟪err := err0⟫ true
Proof step 5:
ebm-vol-inv(avol) ⊦ ∃ err0. ⌊err0⌋ ∨ err0 = ESUCCESS

Rule argument

Additional information