document.write( "Question 1193810: Prove directly - NO Conditional Proof or Indirect Proof. \r
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Algebra.Com's Answer #826305 by Edwin McCravy(20054)\"\" \"About 
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document.write( "    1.  R ⊃ A   / R ⊃ (A v W)\r\n" );
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document.write( "    2.  R ⊃ (A v W)    1,addition\r\n" );
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document.write( "[Replacing A by A v W,  sometimes called \"disjunction introduction\"]\r\n" );
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document.write( "https://www.youtube.com/watch?v=IN9nUurGpsk\r\n" );
document.write( "https://en.wikipedia.org/wiki/Disjunction_introduction\r\n" );
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document.write( "Edwin
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