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| November 25th, 2013, 09:11 AM | #1 |
| Newbie Joined: Nov 2013 Posts: 1 Thanks: 0 | Symbolic logic, SD rules, sub-derivation question
Say you are working in sub-derivation A and have created another sub-derivation within it called B. Is it valid, when working within sub-derivation B, to cite items from sub-derivation A? Here is the problem in question (from my homework, lines 11 and 13): http://i3.minus.com/jbuXxroZfpARj3.jpg |
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| December 22nd, 2013, 01:09 PM | #2 | |
| Senior Member Joined: Dec 2013 From: Russia Posts: 327 Thanks: 108 | Re: Symbolic logic, SD rules, sub-derivation question Quote:
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