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.
##
## Licensing information can be found in the README file of this package.
##
#############################################################################
##
<#GAPDoc Label="MinimalIdealGeneratingSet">
<ManSection>
<Attr Name = "MinimalIdealGeneratingSetJames D. Mitchell
Returnsminimalsetideal ideal<Returns>
<java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 2
function a set of parentof the
semigroup
Thenotion thegenerators of idealis from notionof
the generators of a semigroup or monoid. In particular, the semigroup
generated by the generators of an ideal is not, in general, equal to that
ideal. Use <Ref Attr = "GeneratorsOfSemigroup" BookName = "ref"/> to obtain a
semigroup generating set for an ideal, but beware that this can< Name ="inimalIdealGeneratingSet =""/
costly.
<Example><![CDATA[
gap> S := Monoid([
> Bipartition([[1, 2, 3, -2], [java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 17
> ([1,4,-, -] 2 -,-] 3]];;
gap> I := SemigroupIdeal
gap>MinimalIdealGeneratingSet;
[ <block bijection: [ 1, -1 ], [ 2, -2 ], [ 3, -3 ], [ 4, -4 ]> ]]]></Example>
<Description
</ManSection.Use < Attr"eneratorsOfSemigroup"BookName=r">to obtain a
<#/GAPDoc>
<#GAPDoc Label="GeneratorsOfSemigroupIdeal">
<>
Attr Name ="eneratorsOfSemigroupIdeal Arg = "">
<>generatorsof ideal of semigroup<Returns>
<Description>
This function returns the generatorsgap>S : Monoid(java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 18
which were used to defined <A>I</A> when it was created. <P/ ([ ,-,-4,[, 1,3] []));
If <A>I</A> is an ideal of agap =SemigroupIdeal,S
least < bijection ,- , 2, -2 ], [ 3, -3 ], [ 4, -4 ]> ]]]></Example>
C said<><E<><A>
<P/>
The notion of the generators of an ideal is distinct from the notion of
he ofsemigroup ,
Attr java.lang.StringIndexOutOfBoundsException: Range [51, 44) out of bounds for length 57
ideal to /it./
semigroup
stly
<Example><! >S> <JC E<>>/>java.lang.StringIndexOutOfBoundsException: Index 81 out of bounds for length 81
gap> S := Semigroup(
> Bipartition([[1, 2, 3,java.lang.StringIndexOutOfBoundsException: Range [23, 22) out of bounds for length 79
> Bipartition([[1, 2, 3, -3], [4], [-1], [-2, -4]]),
> ([[, 3,2,[, 4,[134])
> Example>!CDATA S: Semigroup(
> Bipartition([[1], [2,>Bipartition([1, 23,4,-,[2,-], [3],
gap> I := SemigroupIdeal(S,>Bipartition([[1,2,,-3][] -] -,-])
gap> Bipartition[1,3,-] [ ] [13,-]),
[ <bipartition: [ 1, 2, 3, 4, -4>Bipartition([1],[2,3, 4],[1,-34] [2]),
ap> =Semigroup(eneratorsOfSemigroupIdealI);
false]]></Example>
</Description>
</ManSection>
<#/GAPDoc>
<#GAPDoc Label="SemigroupIdeal">
<ManSection>
<Func Name = "SemigroupIdeal" Arg = "S, obj1, obj2, gap> I = SemigroupIdeal(S, I;
Returns
An ideal of a semigroup<bipartition:[12
</>
<Description>
If<A>bj1</>,<A>bj2</>, .. >/Example>
semigroup <A>S</A> /Description>
emigroups of<A) CSemigroupIdeal<> the 2sidedjava.lang.StringIndexOutOfBoundsException: Range [20, 19) out of bounds for length 71
AA,A><A>. Pjava.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
/Returns
isleast2 a ><Ccontaininga <<Cof
<><!CDATA
> S :SymmetricInverseMonoidjava.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
<symmetric inverse monoid of degree 10>
gap> I := SemigroupIdeal(S, PartialPerm([1, 2]));
<inverse partial perm semigroup ideal of rank 10 with 1 generator>
gap> Size(I); 4151
gap> I := SemigroupIdeal(S, I, Idempotents(S));
<inverse partial perm semigroup ideal of rank 10 with 1025 generators>]]></Example>
</Description>
</ManSection>
<#/GAPDoc>
<#GAPDoc Label="SupersemigroupOfIdeal">
<ManSection>
<Attr Name = "SupersemigroupOfIdeal" Arg = "I"/>
<Returns>
An ideal of a semigroup.
</Returns>
<Description>
The <Ref Func = "Parent" BookName = "ref"/> of an ideal is the semigroup in
which the ideal was created, i.e. the first argument of <Ref
Func = "SemigroupIdeal"/> or <C>SemigroupIdealByGenerators</C>. This
function returns the semigroup containing the generators of the semigroup
(i.e. <Ref Attr = "GeneratorsOfSemigroup" BookName = "ref"/>) which are
used to compute the ideal.
<P/>
For a regular semigroup ideal, <C>SupersemigroupOfIdeal</C> will always be
the top most semigroup used to create any of the predecessors of the
current ideal. For example, if <C>S</C> is a semigroup, <C>I</C> is a
regular ideal of <C>S</C>, and <C>J</C> is an ideal of <C>I</C>, then
<C>Parent(J)</C> is <C>I</C> and <C>SupersemigroupOfIdeal(J)</C> is
<C>S</C>. This is to avoid computing a generating set for <C>I</C>,
in this example, which is expensive and unnecessary since <C>I</C> is
regular (in which case the Green's relations of <C>I</C> are just
restrictions of the Green's relations on <C>S</C>).
<P/>
If <C>S</C> is a semigroup, <C>I</C> is a non-regular ideal of <C>S</C>,
<C>J</C> is an ideal of <C>I</C>, then <C>SupersemigroupOfIdeal(J)</C> is
<C>I</C>, since we currently have to use <C>GeneratorsOfSemigroup(I)</C>
to compute anything about <C>I</C> other than its size and membership.
<Example><![CDATA[
gap> S := FullTransformationSemigroup(8);
<full transformation monoid of degree 8>
gap> x := Transformation([2, 6, 7, 2, 6, 1, 1, 5]);;
gap> D := DClass(S, x);
<Green's D-class: Transformation( [ 2, 6, 7, 2, 6, 1, 1, 5 ] )>
gap> R := PrincipalFactor(D);
<Rees 0-matrix semigroup 1050x56 over Group([ (2,8,7,4,3), (3,4) ])>
gap> S := Semigroup(List([1 .. 10], x -> Random(R)));
<subsemigroup of 1050x56 Rees 0-matrix semigroup with 10 generators>
gap> I := SemigroupIdeal(S, MultiplicativeZero(S));
<regular Rees 0-matrix semigroup ideal with 1 generator>
gap> SupersemigroupOfIdeal(I);
<subsemigroup of 1050x56 Rees 0-matrix semigroup with 10 generators>
gap> J := SemigroupIdeal(I, Representative(MinimalDClass(S)));
<regular Rees 0-matrix semigroup ideal with 1 generator>
gap> Parent(J) = I;
true
gap> SupersemigroupOfIdeal(J) = I;
false]]></Example>
</Description>
</ManSection>
<#/GAPDoc>
<#GAPDoc Label="Ideals">
<ManSection>
<Attr Name = "Ideals" Arg = "S" Label = "for a semigroup"/>
<Returns>
An list of ideals.
</Returns>
<Description>
If <A>S</A> is a finite non-empty semigroup, then this attribute returns a
list of the non-empty two-sided ideals of <A>S</A>. <P/>
The ideals are returned in no particular order, and each ideal uses the
minimum possible number of generators
(see <Ref Attr = "GeneratorsOfSemigroupIdeal"/>).
<Example><![CDATA[
gap> S := Semigroup([Transformation([4, 3, 4, 1]),
> Transformation([4, 3, 2, 2])]);
<transformation semigroup of degree 4 with 2 generators>
gap> Ideals(S);
[ <non-regular transformation semigroup ideal of degree 4 with 1 generator>,
<non-regular transformation semigroup ideal of degree 4 with 1 generator>,
<non-regular transformation semigroup ideal of degree 4 with 2 generators>,
<regular transformation semigroup ideal of degree 4 with 1 generator>,
<non-regular transformation semigroup ideal of degree 4 with 1 generator>,
<regular transformation semigroup ideal of degree 4 with 1 generator>
]
]]></Example>
</Description>
</ManSection>
<#/GAPDoc>
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