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+<head>
+<title>nan(3) - Plan 9 from User Space</title>
+<meta content="text/html; charset=utf-8" http-equiv=Content-Type>
+</head>
+<body bgcolor=#ffffff>
+<table border=0 cellpadding=0 cellspacing=0 width=100%>
+<tr height=10><td>
+<tr><td width=20><td>
+<tr><td width=20><td><b>NAN(3)</b><td align=right><b>NAN(3)</b>
+<tr><td width=20><td colspan=2>
+    <br>
+<p><font size=+1><b>NAME     </b></font><br>
+
+<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
+
+    NaN, Inf, isNaN, isInf &ndash; not-a-number and infinity functions<br>
+    
+</table>
+<p><font size=+1><b>SYNOPSIS     </b></font><br>
+
+<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
+
+    <tt><font size=+1>#include &lt;u.h&gt;<br>
+    #include &lt;libc.h&gt; 
+    <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
+    </font></tt>
+    <tt><font size=+1>double NaN(void) 
+    <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
+    </font></tt>
+    <tt><font size=+1>double Inf(int) 
+    <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
+    </font></tt>
+    <tt><font size=+1>int &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;isNaN(double) 
+    <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
+    </font></tt>
+    <tt><font size=+1>int &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;isInf(double, int)<br>
+    </font></tt>
+</table>
+<p><font size=+1><b>DESCRIPTION     </b></font><br>
+
+<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
+
+    The IEEE floating point standard defines values called &#8216;not-a-number&#8217;
+    and positive and negative &#8216;infinity&#8217;. These values can be produced
+    by such things as overflow and division by zero. Also, the library
+    functions sometimes return them when the arguments are not in
+    the domain, or the result is out of range. 
+    <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
+    
+    <i>NaN</i> returns a double that is not-a-number. <i>IsNaN</i> returns true
+    if its argument is not-a-number. 
+    <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
+    
+    <i>Inf</i>(<i>i</i>) returns positive infinity if <i>i</i> is greater than or equal
+    to zero, else negative infinity. <i>IsInf</i> returns true if its first
+    argument is infinity with the same sign as the second argument.<br>
+    
+</table>
+<p><font size=+1><b>SOURCE     </b></font><br>
+
+<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
+
+    <tt><font size=+1>/usr/local/plan9/src/lib9/nan.c<br>
+    </font></tt>
+</table>
+
+<td width=20>
+<tr height=20><td>
+</table>
+<!-- TRAILER -->
+<table border=0 cellpadding=0 cellspacing=0 width=100%>
+<tr height=15><td width=10><td><td width=10>
+<tr><td><td>
+<center>
+<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a>
+</center>
+</table>
+<!-- TRAILER -->
+</body></html>