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Proof step 4 from proof inv-format (previous step)

⊦ ⟪choose err0 with ⌊err0⌋ ∨ err0 = ESUCCESS in err := err0; if err = ESUCCESS then choose apebs0 with ubi-io-initial(apebs0) in apebs := apebs0 else apebs := ?⟫ (err = ESUCCESS → ubi-io-inv(apebs))

User applied rule choose right

And obtained the following new goals

Proof step 5:
⌊err0⌋ ∨ err0 = ESUCCESS ⊦ ⟪err := err0; if err = ESUCCESS then choose apebs0 with ubi-io-initial(apebs0) in apebs := apebs0 else apebs := ?⟫ (err = ESUCCESS → ubi-io-inv(apebs))
Proof step 15:
⊦ ∃ err0. ⌊err0⌋ ∨ err0 = ESUCCESS

Rule argument

pos: right 1

Proof step 4 from proof inv-format (previous step)

User applied rule choose right

And obtained the following new goals

Rule argument

Additional information