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user 97223
Questions about mathematical devices that read an input stream symbol by symbol and use a state transition map to produce an output stream, maybe using secondary storage.
2
votes
Show that if L is regular, then third(L) is also regular. Hint: Construct an ϵ-NFA from the ...
And, I suspect that that's the purpose of the stuff with the angle brackets.
This is just a way to write elements of a cross product. For example: $$\lbrace 1,2\rbrace\times\lbrace 3,4\rbrace = \ …
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