Unformatted text preview: prove closure or non closure. 3. Define an invalid computation of a Turing machine. 4. Construct a contextfree grammar for the set of invalid computations of a Turing machine starting with a given input x....
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This homework help was uploaded on 09/28/2007 for the course COM S 381 taught by Professor Hopcroft during the Fall '05 term at Cornell.
 Fall '05
 HOPCROFT
 Formal language, upper right corner, homework assignment number, operations union

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