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Theorem subset-delete-01

⊦ st ⊆ st0 → st -- a ⊆ st0

Type: A user defined theorem
Validity: The proof is valid.
Features:
Comment:
Used by: subset-delete-02,
Used by units in proved state:
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 5
Used lemmas: Del-at-strong, Del-in, Subset,
Used spec theorems:
- Used simplifier rules: