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<HTML>
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<HEAD>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
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<TITLE>Advanced Examples</TITLE>
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<BODY TEXT="#000000" BGCOLOR="#C7C3C7" LINK="#0000EF" VLINK="#51188E" ALINK="#FF0000">
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<H2>Some Advanced Examples </H2>
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Be cautious: some of the following formulae have big proofs!
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<HR>
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<TT>
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<DL>
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<DD> => (((a & b) v (a->f) v (b->f))->f)->f</DD>
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<DD> => (a & b & c v ((a->f) v (b->f) v (c->f))->f)->f</DD>
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<DD> => d&(b->b->a)&(c->c->b)&(d->d->c)->a</DD>
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</DL>
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</TT>
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<HR>
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<ADDRESS>
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<A HREF="mailto:Christian.Urban@cl.cam.ac.uk">Christian Urban</A></ADDRESS>
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<P><!-- Created: Tue Mar 4 00:23:25 GMT 1997 -->
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<!-- hhmts start -->
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Last modified: Sun Nov 23 20:20:31 GMT 1997
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<!-- hhmts end -->
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</BODY>
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</HTML>
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