In section 1.4,The answer of 13th exercise question is not correct.In the question 13(d), the answer is printed as True. But the Domain under consideration is set of all integers.When we apply negative integers 3n > 4n. Example -6 > -8. So the universal quantifier when applied to the domain the set of integers, ithe given proposition will not hold for all integers. Hence the answer must be false.

This Textbook( 8th edition ) has been used by students of most of all universities in this world. So this error must be noticed.Whats your opinion?

See the attachments.