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Theorem addtwo

⊦ s ++ a ++ b ++ a = s ++ b ++ a

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: subset-insert, subset-insert-01, subset-insert-02,
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: in-02, rax, Extension,
Used spec theorems:
- Used simplifier rules: