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Theorem sub-restr-sub
⊦ ((ns -- n) \ ns0) -- n = (ns \ ns0) -- n
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: 2
Proof steps: 4
Used lemmas:
Used spec theorems:
set-basic
/nat-set/
Extension
set-union
/nat-set/
Difference
Used simplifier rules:
set-union
/nat-set/
del-neq
set-union
/nat-set/
Delete
set-union
/nat-set/
Difference
set-basic
/nat-set/
ne-01
set-union
/nat-set/
diff-del-minus-2
set-union
/nat-set/
del-d