document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=922310>Question 922310</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I cant figure out how to start this proof or complete it after I try<BR>\n" );
document.write( "directions say to use the direct method\r<BR>\n" );
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document.write( "1. (BdotC)horseshoe D<BR>\n" );
document.write( "2. B<BR>\n" );
document.write( "3. Q horseshoe -(-CvD)<BR>\n" );
document.write( "4. -Q triplebar T<BR>\n" );
document.write( "/T </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #559482 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=559482\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I'm going to use & for the \"dot\" and \"->\" for \"horseshoe\"\r<BR>\n" );
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document.write( "<PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">\r\n" );
document.write( "1.  (B & C) -> D\r\n" );
document.write( "2.  B\r\n" );
document.write( "3.  Q -> ~(~C v D)\r\n" );
document.write( "4.  ~Q = T\r\n" );
document.write( "/   T\r\n" );
document.write( "-------------------------------------------------------\r\n" );
document.write( "5.  B -> (C -> D)                 1       Exportation\r\n" );
document.write( "6.  C -> D                        5,2     Modus Ponens\r\n" );
document.write( "7.  ~~(C -> D)                    6       Double Negation\r\n" );
document.write( "8.  ~Q                            3,7     Modus Tollens\r\n" );
document.write( "9.  (~Q -> T) & (T -> ~Q)         4       Material Equivalence\r\n" );
document.write( "10.  ~Q -> T                      9       Simplification\r\n" );
document.write( "11.  T                            10,8    Modus Ponens\r\n" );
document.write( "</PRE>\r<BR>\n" );
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document.write( "Let me know if that helps or not. Thanks.\r<BR>\n" );
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