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<div class="ChapSects" ><a href="chap38.html#X7AE3B902812A10B0" >38 <span class="Heading" > Some functions for accessing basic data</span ></a>
<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap38.html#X7CFDEEC07F15CF82" >38 .1 <span class="Heading" > </span ></a>
</span >
<div class="ContSSBlock" >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap38.html#X7AF313D387F6BA22" >38 .1 -1 BoundaryMap</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap38.html#X826F7E8087BD7649" >38 .1 -2 BoundaryMatrix</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap38.html#X7E6926C6850E7C4E" >38 .1 -3 Dimension</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap38.html#X7AE270A381B40E6D" >38 .1 -4 EvaluateProperty</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap38.html#X7EDAA4E080F7DC03" >38 .1 -5 GroupOfResolution</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap38.html#X780769238600AFD1" >38 .1 -6 Length</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap38.html#X7FB5B44378CA318C" >38 .1 -7 Map </a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap38.html#X7DE8173F80E07AB1" >38 .1 -8 Source </a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap38.html#X7C76423782BA2868" >38 .1 -9 Target</a></span >
</div ></div >
</div >
<h3>38 <span class="Heading" > Some functions for accessing basic data</span ></h3>
<p><a id="X7CFDEEC07F15CF82" name="X7CFDEEC07F15CF82" ></a></p>
<h4>38 .1 <span class="Heading" > </span ></h4>
<p><a id="X7AF313D387F6BA22" name="X7AF313D387F6BA22" ></a></p>
<h5>38 .1 -1 BoundaryMap</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >an style='color: green'>8227; BoundaryMap</code >( <var class="Arg" >C</var > )</td ><td class="tdright" >( function )</td ></tr ></table ></div >
<p>Inputs a resolution, chain complex or cochain complex <span class="SimpleMath" >C</span > and returns the function <span class="SimpleMath" >C!.boundary</span >.</p>
<p><strong class="button" >Examples:</strong > <span class="URL" ><a href="../tutorial/chap2.html" >1 </a></span > , <span class="URL" ><a href="../tutorial/chap10.html" >2 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutTopology.html" >3 </a></span > </p>
<p><a id="X826F7E8087BD7649" name="X826F7E8087BD7649" ></a></p>
<h5>38 .1 -2 BoundaryMatrix</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >an style='color: green'>8227; BoundaryMatrix</code >( <var class="Arg" >C</var >, <var class="Arg" >n</var > )</td ><td class="tdright" >( function )</td ></tr ></table ></div >
<p>Inputs a chain or cochain complex <span class="SimpleMath" >C</span > and integer <span class="SimpleMath" >n</span >><span class="SimpleMath" >0 </span >. It returns the <span class="SimpleMath" >n</span >-th boundary map of <span class="SimpleMath" >C</span > as a matrix.</p>
<p><strong class="button" >Examples:</strong > <span class="URL" ><a href="../tutorial/chap11.html" >1 </a></span > </p>
<p><a id="X7E6926C6850E7C4E" name="X7E6926C6850E7C4E" ></a></p>
<h5>38 .1 -3 Dimension</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >an style='color: green'>8227; Dimension</code >( <var class="Arg" >C</var > )</td ><td class="tdright" >( function )</td ></tr ></table ></div >
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >an style='color: green'>8227; Dimension</code >( <var class="Arg" >M</var > )</td ><td class="tdright" >( function )</td ></tr ></table ></div >
<p>Inputs a resolution, chain complex or cochain complex <span class="SimpleMath" >C</span > and returns the function <span class="SimpleMath" >C!.dimension</span > .</p>
<p>Alternatively, inputs an <span class="SimpleMath" >FpG</span >-module <span class="SimpleMath" >M</span > and returns its dimension as a vector space over the field of <span class="SimpleMath" >p</span > elements.</p>
<p><strong class="button" >Examples:</strong > <span class="URL" ><a href="../tutorial/chap3.html" >1 </a></span > , <span class="URL" ><a href="../tutorial/chap5.html" >2 </a></span > , <span class="URL" ><a href="../tutorial/chap7.html" >3 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCoveringSpaces.html" >4 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCoverinSpaces.html" >5 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutDefinitions.html" >6 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutTDA.html" >7 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutTopology.html" >8 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutLieCovers.html" >9 </a></span > </p>
<p><a id="X7AE270A381B40E6D" name="X7AE270A381B40E6D" ></a></p>
<h5>38 .1 -4 EvaluateProperty</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >an style='color: green'>8227; EvaluateProperty</code >( <var class="Arg" >X</var >, <var class="Arg" >str</var > )</td ><td class="tdright" >( function )</td ></tr ></table ></div >
<p>Inputs a component object <span class="SimpleMath" >X</span > (such as a <span class="SimpleMath" >ZG</span >-resolution or chain map ) and a string <span class="SimpleMath" >str</span >="name" (such as "characteristic" or "type" ). It searches <span class="SimpleMath" >X.property</span > for the pair ["name" ,value] and returns value. If <span class="SimpleMath" >X.property</span > does not exist, or if ["name" ,value] does not exist, it returns fail.</p>
<p><strong class="button" >Examples:</strong ></p>
<p><a id="X7EDAA4E080F7DC03" name="X7EDAA4E080F7DC03" ></a></p>
<h5>38 .1 -5 GroupOfResolution</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >an style='color: green'>8227; GroupOfResolution</code >( <var class="Arg" >R</var > )</td ><td class="tdright" >( function )</td ></tr ></table ></div >
<p>Inputs a <span class="SimpleMath" >ZG</span >-resolution <span class="SimpleMath" >R</span > and returns the group <span class="SimpleMath" >G</span >.</p>
<p><strong class="button" >Examples:</strong ></p>
<p><a id="X780769238600AFD1" name="X780769238600AFD1" ></a></p>
<h5>38 .1 -6 Length</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >an style='color: green'>8227; Length</code >( <var class="Arg" >R</var > )</td ><td class="tdright" >( function )</td ></tr ></table ></div >
<p>Inputs a resolution <span class="SimpleMath" >R</span > and returns its length (i.e. the number of terms of <span class="SimpleMath" >R</span > that HAP has computed).</p>
<p><strong class="button" >Examples:</strong > <span class="URL" ><a href="../tutorial/chap3.html" >1 </a></span > , <span class="URL" ><a href="../tutorial/chap4.html" >2 </a></span > , <span class="URL" ><a href="../tutorial/chap5.html" >3 </a></span > , <span class="URL" ><a href="../tutorial/chap6.html" >4 </a></span > , <span class="URL" ><a href="../tutorial/chap10.html" >5 </a></span > , <span class="URL" ><a href="../tutorial/chap12.html" >6 </a></span > , <span class="URL" ><a href="../tutorial/chap13.html" >7 </a></span > , <span class="URL" ><a href="../tutorial/chap14.html" >8 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutArithmetic.html" >9 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutBogomolov.html" >10 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutPerformance.html" >11 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCoveringSpaces.html" >12 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCoverinSpaces.html" >13 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutQuandles.html" >14 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutquasi.html" >15 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutRandomComplexes.html" >16 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutGouter.html" >17 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutTensorSquare.html" >18 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutTopology.html" >19 </a></span > </p>
<p><a id="X7FB5B44378CA318C" name="X7FB5B44378CA318C" ></a></p>
<h5>38 .1 -7 Map </h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >an style='color: green'>8227; Map </code >( <var class="Arg" >f</var > )</td ><td class="tdright" >( function )</td ></tr ></table ></div >
<p>Inputs a chain map , or cochain map or equivariant chain map <span class="SimpleMath" >f</span > and returns the mapping function (as opposed to the target or the source of <span class="SimpleMath" >f</span >) .</p>
<p><strong class="button" >Examples:</strong > <span class="URL" ><a href="../tutorial/chap1.html" >1 </a></span > , <span class="URL" ><a href="../tutorial/chap2.html" >2 </a></span > , <span class="URL" ><a href="../tutorial/chap4.html" >3 </a></span > , <span class="URL" ><a href="../tutorial/chap5.html" >4 </a></span > , <span class="URL" ><a href="../tutorial/chap6.html" >5 </a></span > , <span class="URL" ><a href="../tutorial/chap7.html" >6 </a></span > , <span class="URL" ><a href="../tutorial/chap10.html" >7 </a></span > , <span class="URL" ><a href="../tutorial/chap13.html" >8 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutAbelianCategories.html" >9 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCoefficientSequence.html" >10 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCohomologyRings.html" >11 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutPoincareSeries.html" >12 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCoveringSpaces.html" >13 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCoverinSpaces.html" >14 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutFunctorial.html" >15 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutGouter.html" >16 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutTopology.html" >17 </a></span > </p>
<p><a id="X7DE8173F80E07AB1" name="X7DE8173F80E07AB1" ></a></p>
<h5>38 .1 -8 Source </h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >an style='color: green'>8227; Source </code >( <var class="Arg" >f</var > )</td ><td class="tdright" >( function )</td ></tr ></table ></div >
<p>Inputs a chain map , or cochain map , or equivariant chain map , or <span class="SimpleMath" >FpG</span >-module homomorphism <span class="SimpleMath" >f</span > and returns it source .</p>
<p><strong class="button" >Examples:</strong > <span class="URL" ><a href="../tutorial/chap2.html" >1 </a></span > , <span class="URL" ><a href="../tutorial/chap4.html" >2 </a></span > , <span class="URL" ><a href="../tutorial/chap7.html" >3 </a></span > , <span class="URL" ><a href="../tutorial/chap8.html" >4 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutAbelianCategories.html" >5 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutNonabelian.html" >6 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCoefficientSequence.html" >7 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCoveringSpaces.html" >8 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCoverinSpaces.html" >9 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutFunctorial.html" >10 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutLieCovers.html" >11 </a></span > </p>
<p><a id="X7C76423782BA2868" name="X7C76423782BA2868" ></a></p>
<h5>38 .1 -9 Target</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >an style='color: green'>8227; Target</code >( <var class="Arg" >f</var > )</td ><td class="tdright" >( function )</td ></tr ></table ></div >
<p>Inputs a chain map , or cochain map , or equivariant chain map , or <span class="SimpleMath" >FpG</span >-module homomorphism <span class="SimpleMath" >f</span > and returns its target.</p>
<p><strong class="button" >Examples:</strong > <span class="URL" ><a href="../tutorial/chap1.html" >1 </a></span > , <span class="URL" ><a href="../tutorial/chap2.html" >2 </a></span > , <span class="URL" ><a href="../tutorial/chap7.html" >3 </a></span > , <span class="URL" ><a href="../tutorial/chap8.html" >4 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutAbelianCategories.html" >5 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCoefficientSequence.html" >6 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCoveringSpaces.html" >7 </a></span > , <span class="URL" ><a href="../www/SideLinks/About/aboutCoverinSpaces.html" >8 </a></span > </p>
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