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Theorem size-union

⊦ s ∩ s0 = ∅ → #(s ∪ s0) = # s + # s0

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 5
Proof steps: 18
Used lemmas: Union, unrax, unadd-01, unc, una, une, int-c, int-a, int-rax,
Used spec theorems:
- set-basic/Size-insert
Used simplifier rules: