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<h1 >walrus</h1 >
<h2>A new approach to proving hyperbolicity</h2>
<p>
0.9991</p>
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21 February 2022
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<p><b>
Markus Pfeiffer
</b>
<br />Email: <span class="URL" ><a href="mailto:markus.pfeiffer@st-andrews.ac.uk" >markus.pfeiffer@st-andrews.ac.uk</a></span >
<br />Homepage: <span class="URL" ><a href="http://www.morphism.de/~markusp/ " >http://www.morphism.de/~markusp/</a></span >
<br />Address : <br />School of Computer Science<br /> University of St Andrews<br /> Jack Cole Building, North Haugh<br /> St Andrews, Fife, KY16 9SX<br /> United Kingdom<br />
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<h3>Contents<a id="contents" name="contents" ></a></h3>
<div class="ContChap" ><a href="chap1_mj.html#X8389AD927B74BA4A" >1 <span class="Heading" >Overview</span ></a>
<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap1_mj.html#X7A489A5D79DA9E5C" >1.1 <span class="Heading" >Examples</span ></a>
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<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap1_mj.html#X7DE9B0FF7EEC5D80" >1.1-1 TriangleGroup</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap1_mj.html#X7A3CD8E481C3E802" >1.1-2 TriangleCommutatorQuotient</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap1_mj.html#X78BB0EB087263795" >1.1-3 RandomTriangleQuotient</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap1_mj.html#X7968AC7887291888" >1.1-4 JackButtonGroup</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap1_mj.html#X863AAC9078647B94" >1.1-5 RandomPregroupPresentation</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap1_mj.html#X7DEF4DA6781CCE1B" >1.1-6 RandomPregroupWord</a></span >
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<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap1_mj.html#X861436A7862A92D2" >1.2 <span class="Heading" >Testing Hyperbolicity</span ></a>
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<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap1_mj.html#X792204DC7B217ECC" >1.3 <span class="Heading" >The MAGMA-compatible interface</span ></a>
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<div class="ContChap" ><a href="chap2_mj.html#X84CF717F7CE7F8A4" >2 <span class="Heading" >Pregroups</span ></a>
<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap2_mj.html#X7F44CAE5832B8511" >2.1 <span class="Heading" >Creating Pregroups</span ></a>
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<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X7E37DF907C05522C" >2.1-1 PregroupByTable</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X8137D096798C1BC8" >2.1-2 PregroupByRedRelators</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X8632A365791D87B7" >2.1-3 PregroupOfFreeProduct</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X8344F038858426A6" >2.1-4 PregroupOfFreeGroup</a></span >
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<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap2_mj.html#X7B1844C180E739B9" >2.2 <span class="Heading" >Filters and Representations</span ></a>
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<div class="ContSSBlock" >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X86AA05DA7B7BA64B" >2.2-1 IsPregroup</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X78E417B3823387C2" >2.2-2 IsPregroupTableRep</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X84F97B4D79FBAD44" >2.2-3 IsPregroupOfFreeGroupRep</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X82866B1A7D018BB7" >2.2-4 IsPregroupOfFreeProductRep</a></span >
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<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap2_mj.html#X8053940287FA4077" >2.3 <span class="Heading" >Attributes, Properties, and Operations</span ></a>
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<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X7946D406823A935B" >2.3-1 []</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X80EC827C83DB818B" >2.3-2 IntermultPairs</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X7C1AE0D983EF9693" >2.3-3 One</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X8761B5A57CC4DEA8" >2.3-4 MultiplicationTable</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X7BF3B344878B252F" >2.3-5 SetPregroupElementNames</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X82B7E2227A94AC98" >2.3-6 PregroupElementNames</a></span >
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<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap2_mj.html#X7E4700087FC3F933" >2.4 <span class="Heading" >Elements of Pregroups</span ></a>
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<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X7CACF96A831CEB1F" >2.4-1 IsElementOfPregroup</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X80185F7579C23714" >2.4-2 IsElementOfPregroupRep</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X838ECC967A2377BA" >2.4-3 IsElementOfPregroupOfFreeGroupRep</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X784ACAE2800C3E7E" >2.4-4 PregroupOf</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X84A42E6B7D542AD1" >2.4-5 IsDefinedMultiplication</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X86FC5FDF87C3664A" >2.4-6 IsIntermultPair</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X87004CD07832F9DB" >2.4-7 PregroupInverse</a></span >
</div ></div >
<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap2_mj.html#X870A0A6A7CAE4680" >2.5 <span class="Heading" >Small Pregroups</span ></a>
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<div class="ContSSBlock" >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X7AAEA96C79A55FB3" >2.5-1 NrSmallPregroups</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap2_mj.html#X7FD30E6F812704C8" >2.5-2 SmallPregroup</a></span >
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<div class="ContChap" ><a href="chap3_mj.html#X7A05461687E1FA84" >3 <span class="Heading" >Pregroup Presentations</span ></a>
<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap3_mj.html#X7AFDBDC078777B90" >3.1 <span class="Heading" >Concepts</span ></a>
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<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X83BEFE747F7726F5" >3.1-1 <span class="Heading" >Locations</span ></a>
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<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X87FA460D81566861" >3.1-2 <span class="Heading" >Places</span ></a>
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<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap3_mj.html#X7C701DBF7BAE649A" >3.2 <span class="Heading" >Attributes</span ></a>
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<div class="ContSSBlock" >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X81378EEB81DF801A" >3.2-1 IsPregroupLocation</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X85EC64DC8116AF77" >3.2-2 InLetter</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X7E1013A1794D17DD" >3.2-3 OutLetter</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X81E1F7F984EC37C2" >3.2-4 Places</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X7C88C1227C073A36" >3.2-5 NextLocation</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X83B0E7F778108E23" >3.2-6 PrevLocation</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X796A41AD85E9AD40" >3.2-7 __ID</a></span >
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<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap3_mj.html#X85C45E1578DB9E13" >3.3 <span class="Heading" >Creating Pregroup Presentations</span ></a>
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<div class="ContSSBlock" >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X7B85A7217AF54FB1" >3.3-1 NewPregroupPresentation</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X78A45CA479E37F10" >3.3-2 PregroupPresentationFromFp</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X7D9C7247794CA029" >3.3-3 PregroupPresentationToFpGroup</a></span >
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<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap3_mj.html#X7FC6BCF985E6819C" >3.4 <span class="Heading" >Filters, Attributes, and Properties</span ></a>
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<div class="ContSSBlock" >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X8194DE3E7908C921" >3.4-1 IsPregroupPresentation</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X84191A7B78073D28" >3.4-2 </a></span >
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<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap3_mj.html#X7E53DCE97DEEFA7D" >3.5 <span class="Heading" >Hyperbolicity testing for pregroup presentations</span ></a>
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<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X7C607CC18455D320" >3.5-1 RSymTestOp</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X83D3AC54833FF1CE" >3.5-2 RSymTest</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X7DB6545987479C4B" >3.5-3 IsHyperbolic</a></span >
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<div class="ContSect" ><span class="tocline" ><span class="nocss" > </span ><a href="chap3_mj.html#X801CA5197DF125C6" >3.6 <span class="Heading" >Input and Output of Pregroup Presentations</span ></a>
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<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X81F8BD2784FA17A5" >3.6-1 PregroupPresentationToKBMAG</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X844A431F8505219D" >3.6-2 PregroupPresentationToStream</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X86E791EB7FCD6FC7" >3.6-3 PregroupPresentationFromStream</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X84B44E0580AE5C2A" >3.6-4 PregroupPresentationToSimpleStream</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X7B118D1D84350906" >3.6-5 PregroupPresentationToFile</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X808C30267956C4B0" >3.6-6 PregroupPresentationFromFile</a></span >
<span class="ContSS" ><br /><span class="nocss" > </span ><a href="chap3_mj.html#X84C6E86D7D3EC053" >3.6-7 PregroupPresentationToSimpleFile</a></span >
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