A language L 1 is smaller than another language L 2 if L 1 L 2
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A language L1 is smaller than another language L2 if L1 ⊂ L2 and L1 ≠ L2• Let T be any language closed under concatenation; that is, if t1 ∈ T and t2 ∈ T. then t1 t2 is also an element of T. Show that if T contains S but T ≠ S*, then S* is smaller than T. We can summarize this by saying that S* is the smallest closed language containing S.
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