# Discrete structures and logical equivalences

Q1) Use the standard logical equivalences to simplify the expression

(ㄱp ^ q) v ㄱ(pVq)

Q2) consider the following theorem

"The square of every odd natural number is again an odd number"

What is the hypothesis of the theorem? what is the conclusion? give a direct proof of the theorem.

Q3) consider the following theorem

" The sum of a rational number and an irrational number is an irrational number.

What is the hypothesis of the theorem? what is the conclusion? Give a direct proof of the theorem

Q4) Prove that for any integer n, 3ㅣn^3+2n (Hint, consider 3 separate cases)

Q5) For the following sets A and B find A∪B, A∩B and AB.

a) A={1,2,a} B={2,3,a} b) A={2,7,b), B={7,3,4} c) A=Z, B=N

Q6) Write down the power sets for each of the following sets:

a) φ b) {φ} c) {4,7}

Q7) Find the Cartesian products A*B, B^2 and A^3 for the sets A={0,x} and B={0,1,4}.

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#### Solution Summary

The following posting provides an example of working with logic (theorems and statements), sets, and proofs.