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# hw1 - Problem Set 1 Elementary Logic Due 3 October 2007...

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Problem Set 1 Elementary Logic Due: 3 October 2007 Name Student ID Number email Mark % Due 3 October 2007 by 4:00PM . Submit your problem set to Ms. Loletta Li in Main Building 312. Make sure your problem set is timestamped. Do not submit assignments by email. Late penalty: 10% for each day late. This problem set will not be accepted after 5 October. Answer the questions on the problem set itself. Write neatly. If the grader cannot read your handwriting, you will not receive credit. Be sure that all pages of the assignment are securely stapled together. Check the course bulletin board for announcements about the assignment. Do your own work. If you copy your problem set, or permit others to copy, you may fail the course. 1

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1. (15 marks) True or false? Circle ‘T’ if the statement is true. Circle ‘F’ if the statement is false. For this question, you should assume that ϕ is a WFF of SL. T F If an argument is valid and has a true conclusion, then it is sound. T F Some arguments of the form “affirming the consequent” are valid. T F If ϕ is a negation, then ϕ contains the symbol “)”. T F An argument is sound if and only if it does not contain a hidden premise. T F A valid argument with a true conclusion might have a false premise.
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