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Theorem at-del

¬ null ∈ h, r ∈ h ⊦ r ≠ r0 → (h --h r0)[r]h = h[r]h

Type: A proof obligation
Validity: The proof is valid.
Features:
Comment: r \in h |- not r = r0 -> (h -- r0)(r) = 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: 2
Used lemmas:
Used spec theorems:
- Used simplifier rules: