You are given the following logical expression (+ representing the logical OR, concatenation representing the logical AND): (x + w)(w + z) (a) Is this expression (already) in conjunctive normal form (CNF)? If not, use the procedure described on the lectures to put it in CNF. (b) Use the procedure described on the lectures -- by introducing new logical variables transform the given expression into a 3-CNF expression that is satisfiable if and only if the given expression is satisfiable. (c) Construct an undirected graph from the 3-CNF expression that you constructed in (b) (following the procedure described on the lectures) and find one of the minimal node covers of that graph. What is the budget k?

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Homework 9  Satisfiability

You are given the following logical expression (+ representing the logical ORconcatenation representing the logical AND):

(x + w)(w + z)

(a) Is this expression (already) in conjunctive normal form (CNF)?
If not, use the procedure described on the lectures to put it in CNF.
(b) Use the procedure described on the lectures -- by introducing new logical variables transform the given expression into a 3-CNF expression that is satisfiable if and only if the given expression is satisfiable.
(c) Construct an undirected graph from the 3-CNF expression that you constructed in (b) (following the procedure described on the lectures) and find one of the minimal node covers of that graph. What is the budget k?

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