<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html > <head><title></title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="generator" content="TeX4ht (http://www.cse.ohio-state.edu/~gurari/TeX4ht/)"> <meta name="originator" content="TeX4ht (http://www.cse.ohio-state.edu/~gurari/TeX4ht/)"> <!-- 3,html --> <meta name="src" content="nipguide.tex"> <meta name="date" content="2010-06-30 13:34:00"> <link rel="stylesheet" type="text/css" href="nipguide.css"> </head><body > <div class="footnote-text"> <!--l. 317--><p class="indent" > <span class="footnote-mark"><a id="fn1x6"> <sup class="textsuperscript">1</sup></a></span><span class="ptmr7t-x-x-80">Since programs are referentially transparent (that is, the value of an</span> <span class="ptmr7t-x-x-80">expression depends only upon its syntactic context, not upon computation</span> <span class="ptmr7t-x-x-80">history), you can easily do equational reasoning, proof by induction, and so</span> <span class="ptmr7t-x-x-80">on.</span> <!--l. 317--><p class="indent" > <span class="ptmr7t-x-x-80">Expressions are like theorems, definitions are like axioms, computation</span> <span class="ptmr7t-x-x-80">is like proof.</span></div> </body></html>