<Chapter Label = "Green's relations">
<Heading>
Green's relations
</Heading>
In this chapter we describe the functions in &SEMIGROUPS; for
computing Green's classes and related properties of semigroups.
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<Section>
<Heading>
Creating Green's classes and representatives
</Heading>
In this section, we describe the methods in the &SEMIGROUPS; package for
creating Green's classes.
<P/>
<#Include Label = "XClassOfYClass">
<#Include Label = "GreensXClassOfElement">
<#Include Label = "GreensXClassOfElementNC">
<#Include Label = "GreensXClasses">
<#Include Label = "XClassReps">
<#Include Label = "MinimalDClass">
<#Include Label = "MaximalXClasses">
<#Include Label = "NrRegularDClasses">
<#Include Label = "NrXClasses">
<#Include Label = "PartialOrderOfXClasses">
<#Include Label = "LengthOfLongestDClassChain">
<#Include Label = "IsGreensDGreaterThanFunc">
</Section>
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<Section>
<Heading>
Iterators and enumerators of classes and representatives
</Heading>
In this section, we describe the methods in the &SEMIGROUPS; package for
incrementally determining Green's classes or their representatives.
<P/>
<#Include Label = "IteratorOfXClassReps">
<#Include Label = "IteratorOfXClasses">
</Section>
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<Section>
<Heading>
Properties of Green's classes
</Heading>
In this section, we describe the properties and operators of Green's
classes that are available in the &SEMIGROUPS; package.
<P/>
<#Include Label = "\<">
<#Include Label = "IsRegularGreensClass">
<#Include Label = "IsGreensClassNC">
</Section>
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<Section>
<Heading>
Attributes of Green's classes
</Heading>
In this section, we describe the attributes of Green's classes that are
available in the &SEMIGROUPS; package.
<P/>
<#Include Label = "GroupHClass">
<#Include Label = "SchutzenbergerGroup">
<#Include Label = "StructureDescriptionSchutzenbergerGroups">
<#Include Label = "StructureDescriptionMaximalSubgroups">
<#Include Label = "MultiplicativeNeutralElement">
<#Include Label = "StructureDescription">
<#Include Label = "InjectionPrincipalFactor">
<#Include Label = "PrincipalFactor">
</Section>
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<Section>
<Heading>
Operations for Green's relations and classes
</Heading>
In this section, we describe some operations related to Green's classes that are
available in the &SEMIGROUPS; package.
<P/>
<#Include Label = "GreensMultiplier">
</Section>
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</Chapter>
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