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Theorem del-addeq-03

⊦ a ∈ s ∧ a ≠ b → (s -- b) ++ a = s -- b

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp, localcut,
Comment:
Used by:
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: del-in-01,
Used spec theorems:
- Used simplifier rules:
  - infset-basic/eq-03