Question 1042733
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I'm assuming that you don't bother to differentiate between upper and lower case, although in all forms of mathematics it makes a difference.
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 1.  N -> R
 2.  O <-> R
 3.  (O -> R) -> L          |  (N -> O) & L

 4.  (R -> O)               2, Biconditional Elimination
 5.  (N -> O)               1, 4, Hypothetical Syllogism
 6.  (O -> R)               2, Biconditional Elimination
 7.  L                      3, 6, Modus Ponens    
 8.  :. (N -> O) & L        5, 7, Conjunction Introduction
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John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  

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