304_HW5_F11 - 3. (25 points) Show that the following...

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UML CS Foundations 91.304 (section 201) Fall, 2011 1 Homework Set #5 Assigned: Monday, 10/17 Due: Wednesday, 10/26 (start of lecture) This assignment covers textbook material in Chapter 2.3. Note: Refer to course web site for homework policies. Remember to attach signed honor statement. 1. (25 points) Textbook Problem 2.30(d) on p. 131. Hint : See part(c), whose answer is in the textbook. 2. (25 points) Textbook Problem 2.34 on p. 131. Hint : Exercise 2.13(a) will be done in class.
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Unformatted text preview: 3. (25 points) Show that the following language L 1 is not context free: } such that 1 and * } 1 , { | { 2 1 m n w w w L n m = = ∈ = 4. (25 points) Consider two languages CFL L ∈ 2 and REG L ∈ 3 . Explain your answers to the questions below: a) Is the language 3 2 L L − necessarily in CFL ? ( 3 2 L L − is the set of strings in L 2 with those in L 3 removed.) b) Is the language 2 3 L L − necessarily in CFL ?...
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This note was uploaded on 02/13/2012 for the course CS 91.304 taught by Professor Staff during the Fall '11 term at UMass Lowell.

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