February 18th, 2012, 09:00 PM  #1 
Newbie Joined: Jan 2012 From: France Posts: 22 Thanks: 0  Truth Table,validity...
Hi, I need to show that is a valid argument. I used a truth table, and it worked, but i'm actually required to use an "informal proof" which means to use words, and to be precise. Anyone would know how I could actually explain it? Thank you, Jonathan 
February 19th, 2012, 08:06 AM  #2  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 408  Re: Truth Table,validity... Hello, john616! Quote:
\sim\!A\,\vee\,B)\,\vee\,C \;\equiv\;\sim\!A\,\vee\,(B\,\vee\,C) \;\equiv\;A \to (B\,\vee\,C)" /> [color=beige]. . [/color]  
February 19th, 2012, 12:33 PM  #3 
Newbie Joined: Jan 2012 From: France Posts: 22 Thanks: 0  Re: Truth Table,validity... 

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