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Theorem ad

⊦ a ∈ y → perm(x + (y -1l a), (x + y) -1l a)

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by:
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 6
Used lemmas: oc-zero, oc-del-01, del1, del1-01, ocappend, msubset, perm-def,
Used spec theorems:
- Used simplifier rules: