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Theorem onenotin-diff

⊦ ¬ a ∈ x → a ' \ x = 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: 1
Proof steps: 6
Used lemmas: diff-consnotin2, diff-empty,
Used spec theorems:
- Used simplifier rules:
  - list/c-04
  - list/a
  - list/in-06
  - list/c
  - list/in-17