Are the following sets closed under the following operations? If not, what are their respective closures?
What will be an ideal response?
a) The even length strings over the alphabet {a, b} under Kleene star.
b) The odd length strings over the alphabet {a, b} under concatenation.
a) Closed.
b) Not closed. The closure is all strings over the alphabet {a, b} with length at least 1.
Computer Science & Information Technology
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