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Theorem del-addeq-04

⊦ ¬ a ∈ s → (s ++ a) -- a = s

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp, kodkodax,
Comment:
Used by: del-e, del-size, delete-shift,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 0
Proof steps: 1
Used lemmas: del-in, del-addeq-05,
Used spec theorems:
- Used simplifier rules: