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Theorem Del-at-strong

a ≠ b ⊦ (st -- b)[a] = st[a]

Type: A user defined theorem
Validity: The proof is valid.
Features: s, ls,
Comment:
Used by: del-put, deldel, delete-put-rew, k-Del-rec2, notin-del-notin, subset-put, subset-put-01, subset-put-02,
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: Del-at,
Used spec theorems:
- Used simplifier rules: