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Theorem undel

⊦ a ∈ s → s ∪ (s0 -- a) = s ∪ s0

Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by: undel-01, union-del,
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-rax, unrax, unindel, unc, una, ext,
Used spec theorems:
- Used simplifier rules: