document.write( "Question 1195752: 3. [10] Fill in the derived statements\r
\n" ); document.write( "\n" ); document.write( "1. R\r
\n" ); document.write( "\n" ); document.write( "2. K ⊃ (~X • ~R)\r
\n" ); document.write( "\n" ); document.write( "3. (J v Z) v K / ∴ Z v J\r
\n" ); document.write( "\n" ); document.write( "4. _____________________ 1 DI\r
\n" ); document.write( "\n" ); document.write( "5. _____________________ 4 DeM\r
\n" ); document.write( "\n" ); document.write( "6. _____________________ 5, 2 MT\r
\n" ); document.write( "\n" ); document.write( "7. _____________________ 6, 3 DS\r
\n" ); document.write( "\n" ); document.write( "8. _____________________ 7 comm \n" ); document.write( "

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document.write( "4.   R v X           1, DI   (Disjunction Introduction, or \"Addition\":  if A then certainly \"A or B\" is also true)
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document.write( "5.  ~(~R • ~X)       4, DeM  (DeMorgan's:  a v b  <==> ~(~a • ~b))
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document.write( "6.  ~K               5,2 MT  (Modus Tollens)
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document.write( "7.  J v Z            6,3 DS  (Disjunctive Syllogism)  
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document.write( "8.  Z v J            7  COMM  (Commutation:  A v B  <==> B v A)\r
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