June 21st, 2013, 12:00 PM  #1 
Newbie Joined: Jun 2013 Posts: 2 Thanks: 0  Urgent help needed here pls
contruct a formal proof of the following; If he recieved the wire, then he took the plane and if he took the plane he will not be late for the meeting. If the telegraph was incorrectly addressed, then he will be late for the meeting. He recieved the wire or the telegraph was incorrectly addressed therefore, he took the plane or he will be late for the meeting. 
June 21st, 2013, 04:09 PM  #2 
Senior Member Joined: Sep 2012 From: British Columbia, Canada Posts: 764 Thanks: 53  Re: Urgent help needed here pls
received the wire: p took the plane: q not be late for meeting: r telegraph incorrectly addressed: s by the Law of Syllogism. . We want to prove that . Since this is a disjunction, we can assume that p is false and prove . This is one of our original assumptions, so the proof is complete. P.S. "i" before "e", except after "c". 
June 22nd, 2013, 05:03 AM  #3 
Newbie Joined: Jun 2013 Posts: 2 Thanks: 0  Re: Urgent help needed here pls
Thank you eddybob but we are to prove qV~r only. Not pVs>qV~r.


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