Question: For each of the following pairs of regular languages, find a regular expression and an FA that each define L 1 L 2 :

For each of the following pairs of regular languages, find a regular expression and an FA that each define L₁ ∩ L₂:

We have seen that because the regular languages are closed under union and complement, they must be closed under intersection. Find a collection of languages that is closed under union and intersection but not under complement.

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