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November 25th, 2013, 10:11 AM  #1 
Newbie Joined: Nov 2013 Posts: 1 Thanks: 0  Symbolic logic, SD rules, subderivation question
Say you are working in subderivation A and have created another subderivation within it called B. Is it valid, when working within subderivation B, to cite items from subderivation A? Here is the problem in question (from my homework, lines 11 and 13): http://i3.minus.com/jbuXxroZfpARj3.jpg 
December 22nd, 2013, 02:09 PM  #2  
Senior Member Joined: Dec 2013 From: Russia Posts: 327 Thanks: 108  Re: Symbolic logic, SD rules, subderivation question Quote:
 

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