University of Nevada Las Vegas
Howard R. Hughes College of Engineering
Department of Computer Science
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CSC 456/656 Assignment 9

Due date: Thursday, April 7, 2016, 4:00 PM.

All assignments must be handwritten (not typed or printed from a computer file) in your own handwriting, on 8.5 by 11 inch paper, or on A4 paper. Write your name on each sheet, and do not fold the pages or crimp the corners. (You may use a paper clip or a staple.)
Turn the pages in to me or to the graduate assistant on or before the due date.
  1. Answer these questions by filling in the blanks. (Print out the pages, fill in the blanks, and turn the pages in.)
    In postscript format.

  2. True or false. If L1, L2, ... is an infinite sequence of decidable languages, then the union L1 + L1 + ... of those languages must be decidable. Prove your answer.

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