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Theorem at-write

¬ null ∈ h ⊦ h[r0 := o]h[r]h = (r = r0 ∧ r0 ∈ h ⊃ o;h[r]h)

Type: A proof obligation
Validity: The proof is valid.
Features:
Comment: |- h(r0 := o)(r) = (r = r0 and r0 \in h :: o;h(r))
Used by:
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 5
Used lemmas:
Used spec theorems:
- Used simplifier rules: