My Math Forum Urgent help needed here pls

 Applied Math Applied Math Forum

 June 21st, 2013, 11:00 AM #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, 03:09 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 $p\to q$ $q\to r$ $\therefore p\to r$ by the Law of Syllogism. $s\to \neg r$. We want to prove that $p\vee s \to q\vee \neg r$. Since this is a disjunction, we can assume that p is false and prove $s\to q\vee \neg r$. This is one of our original assumptions, so the proof is complete. P.S. "i" before "e", except after "c".
 June 22nd, 2013, 04:03 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.

 Tags needed, pls, urgent

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post asifrahman1988 Calculus 2 October 27th, 2012 04:06 PM dilshad123 Algebra 5 February 26th, 2010 03:37 PM adii shamz Calculus 1 February 27th, 2009 03:31 AM jumpman23 Applied Math 3 January 20th, 2009 12:23 PM Padmavathi Algebra 4 December 13th, 2006 03:09 AM

 Contact - Home - Forums - Cryptocurrency Forum - Top