Dr Tom Kerns



Assignment hurley1.4

Validity, Truth and Soundness


This assignment is due to be completed by Monday October 12th

This exercise will be available from Oct 1st to Oct 31st

In this assignment you will learn:

  • what valid and invalid deductive arguments are
  • what the difference is between validity and truth
  • What it means to call an argument "sound"


Read chapter 1.4 of Hurley’s A Concise Introduction to Logic, but you need to read only the first four pages of this section, -- only pages 42-45 -- i.e., the section on "Deductive Arguments"

Optional Learning Aids

Sections 1.4 of the Learning Logic program, available either on iLrn or on the CD that came with your Hurley textbook


  • Login to iLrn
  • Navigate to the assignment titled hurley1.4
  • Open that assignment and do those exercises
  • You may re-do the exercises a second time if you like, and a third time, but it won’t allow you to do them more than three times.
  • iLrn will record the score you earn on the final time you did the assignment.