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Let $B$ and $C$ be languages over $\sum = \{0, 1\}.$ Define  $B\overset{1}{\leftarrow} C = \{w\in B|$ $\text{for some}$ $y\in C$, $\text{strings}$ $w$ $\text{and}$ $y$ $\text{contain equal numbers of}$ $1’s\}.$ Show that the class of regular languages is closed under the $\overset{1}{\leftarrow}$operation.
in Theory of Computation by Veteran (50.8k points) | 6 views

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