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# midterm1sol - University of Illinois at Urbana-Champaign...

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University of Illinois at Urbana-Champaign Department of Computer Science Midterm 1 CS 373: Theory of Computation Fall 2009 Name: Netid: Print your name and netid, neatly in the space provided above; print your name at the upper right corner of every page. Please print legibly. This is a closed book exam. No notes, books, dictionaries, calculators, or laptops are permitted. You are free to cite and use any theorems from class or homeworks without having to prove them again. Write your answers in the space provided for the corresponding problem. Let us know if you need more paper. Suggestions: Read through the entire exam first before starting work. Do not spend too much time on any single problem. If you get stuck, move on to something else and come back later. If you run short on time, remember that partial credit will be given. If any question is unclear, ask us for clarification. Question Points Score Problem 1 20 Problem 2 15 Problem 3 15 Problem 4 15 Problem 5 15 Problem 6 20 Total 100

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CS 373 Midterm 1 – Fall 2009 2 Name: 1. Short Problems (20 points) Give answers to each of the following questions, including a short justification. For each, you will get two points for the correct answer and two points for the correct justification. (a) For a language A and DFA M = ( Q, Σ , δ, q 0 , F ) for which A = L ( M ), what can be inferred about the number of equivalence classes for each of the equivalence relations A and M ? (4 points) (b) If A 0
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