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Theorem undel-03

⊦ ¬ a ∈ s → s ∪ (s0 -- a) = (s ∪ s0) -- a

Type: A user defined theorem
Validity: The proof is valid.
Features: localsimp,
Comment:
Used by: subset-is-union, union-del, union-rem-unchdg, union-size-02, unsubdel-01,
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: unc, una, undel-01,
Used spec theorems:
- Used simplifier rules: