document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=903091>Question 903091</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I tried to prove  this but I am lost on how to finish or am I done?\r<BR>\n" );
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document.write( "Proof:<BR>\n" );
document.write( "&#8704; x, P(x) &#8594; R(x) (premise)<BR>\n" );
document.write( "¬R(k) (premise) (DeMorgan’s)<BR>\n" );
document.write( "&#8756; ¬P(k) (universal instantiation)<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #547839 by </B><A HREF=/tutors/aboutme.mpl?userid=solver91311><B>solver91311(24713)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=solver91311><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/cgi-bin/show-face.mpl?user=solver91311><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=547839\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <font face=\"Times New Roman\" size=\"+2\">\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \forall x,\ P(x)\ \right\ R(x)\">  Premise\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \neg R(k)\"> Premise\r<BR>\n" );
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document.write( "Therefore <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \neg P(k)\"> Modus Tollens\r<BR>\n" );
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document.write( "I have no idea what DeMorgan or Universal Instantiation has to do with anything.\r<BR>\n" );
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document.write( "John<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE e^{i\pi}\ +\ 1\ =\ 0\"><BR>\n" );
document.write( "My calculator said it, I believe it, that settles it<BR>\n" );
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