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Theorem union-size-le

⊦ #(s0 ∪ s1) ≤ # s0 + # s1

Type: A user defined theorem
Validity: The proof is valid.
Features:
Comment:
Used by: union-size-not-less, union-size-not-less-01,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 5
Proof steps: 12
Used lemmas: uninsert, unrax, unin, unadd, unc, una, une,
Used spec theorems:
- set-basic/eq
Used simplifier rules: