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Theorem neq

⊦ perm(x, y) ∧ ¬ perm(x0, y) → x ≠ x0

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp, localforward,
Comment:
Used by: a, papp-03, perm-com1, perm-del, perm-del-01, perm-rev,
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: sym-02, sym-01,
Used spec theorems:
- Used simplifier rules: