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Unformatted text preview: 2 are contextfree? 5 CFLs not closed under complement How can we prove that CFLs are not closed under complement? Another way Use fact that any language class which is closed under union and complement must also be closed under intersection 6 Language class hierarchy All languages over alphabet RE REG H H Equal CFL REC Equal3...
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This note was uploaded on 07/25/2008 for the course CSE 460 taught by Professor Torng during the Fall '07 term at Michigan State University.
 Fall '07
 TORNG

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