Hint for Section 1.1 Question 5

5. Since there are two statement variables, the truth table will have 4 rows. Start by filling in the four different combinations of truth values for p and q.

p q   ~q p V q   p  L ~q (p V q) L ~q
T T            
T F            
F T            
F F            

Now fill in columns 3 and 4, using the truth tables for V and ~.

 

p q   ~q p V q   p  L ~q (p V q) L ~q
T T   F T      
T F   T T      
F T   F T      
F F   T F      

Now use columns 1 and 3, and the truth table for L to fill in column 5. Then use columns 4 and 3, and the truth table for L to fill in column 6. Finally, compare columns 5 and 6 to decide if the statements forms p L ~q  and (p V q) L  ~q are logically equivalent.


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