formal language
Determine whether or not context-free languages are closed under each
of the following operations:
(a) Substitution.
(b) Intersection.
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推
12/12 00:11, , 1F
12/12 00:11, 1F
推
12/12 00:27, , 2F
12/12 00:27, 2F
→
12/12 00:27, , 3F
12/12 00:27, 3F
推
12/12 00:56, , 4F
12/12 00:56, 4F
噓
12/12 12:10, , 5F
12/12 12:10, 5F
推
12/12 14:44, , 6F
12/12 14:44, 6F
推
12/13 02:55, , 7F
12/13 02:55, 7F