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Theorem subset-rec

⊦ a ' + x ⊆ y ↔ a ∈ y ∧ x ⊆ y

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 4
Proof steps: 10
Used lemmas: subset,
Used spec theorems:
- Used simplifier rules:
  - list/a
  - list/in-rec