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Theorem union-rem-add

⊦ a ∈ s0 → ((s0 -- a) ∪ s1) ++ a = s0 ∪ s1

Type: A user defined theorem
Validity: The proof is valid.
Features:
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: 2
Used lemmas: Delete, unrax, unindel, unc, una,
Used spec theorems:
- set-basic/Extension
Used simplifier rules: