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Theorem diff-subseteq-subseteq

⊦ as1 ⊆ as2 → (as0 \ as1 ⊆ as2 ↔ as0 ⊆ as2)

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

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 10
Used lemmas:
Used spec theorems:
- set-union/node-store/subdef
Used simplifier rules:
- set-basic/node-store/sub-in
- set-basic/node-store/size-zero-01
- set-basic/node-store/ne-01
- set-union/node-store/Difference