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<div class="ChapSects" ><a href="chap6.html#X868F7BAB7AC2EEBC" >6 <span class="Heading" >Basics</span ></a>
<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap6.html#X7D9044767BEB1523" >6.1 <span class="Heading" >Global variables</span ></a>
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<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap6.html#X7CB459E282D621B2" >6.1-1 HOMALG_TOOLS</a></span >
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<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap6.html#X7D03633A7D98026B" >6.2 <span class="Heading" >GAP Categories</span ></a>
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<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap6.html#X7E36B19C7FFEC100" >6.2-1 IsStructureObjectOrObjectOrMorphism</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap6.html#X7A9BB94E7D9F3AB6" >6.2-2 IsStructureObjectOrObject</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap6.html#X85DC9C0A83ADB0C6" >6.2-3 IsStructureObject</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap6.html#X7D2734947FBEB2EF" >6.2-4 IsStructureObjectMorphism</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap6.html#X8346DBCF876C70F7" >6.2-5 IsHomalgRingOrModule</a></span >
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<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap6.html#X7C701DBF7BAE649A" >6.3 <span class="Heading" >Attributes</span ></a>
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<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap6.html#X791768BD7815B343" >6.3-1 RingFilter</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap6.html#X7CB137BC842F454F" >6.3-2 RingElementFilter</a></span >
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<h3>6 <span class="Heading" >Basics</span ></h3>
<p><a id="X7D9044767BEB1523" name="X7D9044767BEB1523" ></a></p>
<h4>6.1 <span class="Heading" >Global variables</span ></h4>
<p><a id="X7CB459E282D621B2" name="X7CB459E282D621B2" ></a></p>
<h5>6.1-1 HOMALG_TOOLS</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >‣ HOMALG_TOOLS</code ></td ><td class="tdright" >( global variable )</td ></tr ></table ></div >
<p>A central place for configurations.</p>
<p><a id="X7D03633A7D98026B" name="X7D03633A7D98026B" ></a></p>
<h4>6.2 <span class="Heading" >GAP Categories</span ></h4>
<p><a id="X7E36B19C7FFEC100" name="X7E36B19C7FFEC100" ></a></p>
<h5>6.2-1 IsStructureObjectOrObjectOrMorphism</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >‣ IsStructureObjectOrObjectOrMorphism</code >( <var class="Arg" >arg</var > )</td ><td class="tdright" >( filter )</td ></tr ></table ></div >
<p>Returns: <code class="keyw" >true</code > or <code class="keyw" >false</code ></p>
<p>This is the super super GAP-category which will include the GAP-categories IsStructureObjectOrObject and IsHomalgObjectOrMorphism</p>
<p><a id="X7A9BB94E7D9F3AB6" name="X7A9BB94E7D9F3AB6" ></a></p>
<h5>6.2-2 IsStructureObjectOrObject</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >‣ IsStructureObjectOrObject</code >( <var class="Arg" >arg</var > )</td ><td class="tdright" >( filter )</td ></tr ></table ></div >
<p>Returns: <code class="keyw" >true</code > or <code class="keyw" >false</code ></p>
<p>This is the super GAP-category which will include the GAP-categories IsHomalgRing, IsHomalgModule, IsHomalgRingOrModule and IsHomalgComplex</p>
<p><a id="X85DC9C0A83ADB0C6" name="X85DC9C0A83ADB0C6" ></a></p>
<h5>6.2-3 IsStructureObject</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >‣ IsStructureObject</code >( <var class="Arg" >arg</var > )</td ><td class="tdright" >( filter )</td ></tr ></table ></div >
<p>Returns: <code class="keyw" >true</code > or <code class="keyw" >false</code ></p>
<p>This is the super GAP-category which will include the GAP-categories IsHomalgRing we need this GAP-category to define things like Hom(M,R) as easy as Hom(M,N) without distinguishing between structure objects (e.g. rings) and objects (e.g. modules)</p>
<p><a id="X7D2734947FBEB2EF" name="X7D2734947FBEB2EF" ></a></p>
<h5>6.2-4 IsStructureObjectMorphism</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >‣ IsStructureObjectMorphism</code >( <var class="Arg" >arg</var > )</td ><td class="tdright" >( filter )</td ></tr ></table ></div >
<p>Returns: <code class="keyw" >true</code > or <code class="keyw" >false</code ></p>
<p>This is the super GAP-category which will include the GAP-categories IsHomalgRingMap, etc.</p>
<p><a id="X8346DBCF876C70F7" name="X8346DBCF876C70F7" ></a></p>
<h5>6.2-5 IsHomalgRingOrModule</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >‣ IsHomalgRingOrModule</code >( <var class="Arg" >arg</var > )</td ><td class="tdright" >( filter )</td ></tr ></table ></div >
<p>Returns: <code class="keyw" >true</code > or <code class="keyw" >false</code ></p>
<p>this is the super GAP-category which will include the GAP-categories IsHomalgRing, IsHomalgModule:</p>
<p><a id="X7C701DBF7BAE649A" name="X7C701DBF7BAE649A" ></a></p>
<h4>6.3 <span class="Heading" >Attributes</span ></h4>
<p><a id="X791768BD7815B343" name="X791768BD7815B343" ></a></p>
<h5>6.3-1 RingFilter</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >‣ RingFilter</code >( <var class="Arg" >ring</var > )</td ><td class="tdright" >( attribute )</td ></tr ></table ></div >
<p>A filter inheriting from <code class="code" >IsRing</code > which uniquely identifies the ring <var class="Arg" >ring</var >. For example, the ring <code class="code" >Integers</code > is identified by <code class="code" >IsIntegers</code >. If no filter uniquely identifying the ring exists, the most special filter available should be chosen.</p>
<p><a id="X7CB137BC842F454F" name="X7CB137BC842F454F" ></a></p>
<h5>6.3-2 RingElementFilter</h5>
<div class="func" ><table class="func" width="100%" ><tr ><td class="tdleft" ><code class="func" >‣ RingElementFilter</code >( <var class="Arg" >ring</var > )</td ><td class="tdright" >( attribute )</td ></tr ></table ></div >
<p>A filter inheriting from <code class="code" >IsRingElement</code > which uniquely identifies elements of the ring <var class="Arg" >ring</var >. For example, the elements of the ring <code class="code" >Integers</code > are identified by <code class="code" >IsInt</code >. If no filter uniquely identifying the elements of the ring exists, the most special filter available should be chosen.</p>
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