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## elements/pbr.gd
## Copyright (C) 2015-2022 Attila Egri-Nagy
##
## Licensing information can be found in the README file of this package.
##
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# This file contains a declarations for partitioned binary relations (PBRs) as
# defined in:
#
# MARTIN, Paul; MAZORCHUK, Volodymyr.
# Partitioned Binary Relations. MATHEMATICA SCANDINAVICA, v113, n1, p. 30-52,
# https://arxiv.org/abs/1102.0862
DeclareCategory( "IsPBR",
IsMultiplicativeElementWithInverse and
IsAssociativeElementWithStar);
DeclareCategoryCollections( "IsPBR");
DeclareCategoryCollections( "IsPBRCollection");
InstallTrueMethod(IsGeneratorsOfSemigroup, IsPBRCollection);
DeclareOperation( "PBR", [IsDenseList, IsDenseList]);
DeclareGlobalFunction( "PBRNC");
DeclareOperation( "RandomPBR", [IsPosInt]);
DeclareOperation( "RandomPBR", [IsPosInt, IsFloat]);
DeclareOperation( "EmptyPBR", [IsPosInt]);
DeclareOperation( "IdentityPBR", [IsPosInt]);
DeclareOperation( "UniversalPBR", [IsPosInt]);
DeclareAttribute( "DegreeOfPBR", IsPBR);
DeclareAttribute( "DegreeOfPBRCollection", IsPBRCollection);
DeclareOperation( "NumberPBR", [IsPBR]);
DeclareOperation( "PBRNumber", [IsPosInt, IsPosInt]);
DeclareOperation( "AsPBR", [IsMultiplicativeElement, IsPosInt]);
DeclareOperation( "AsPBR", [IsMultiplicativeElement]);
DeclareProperty( "IsEmptyPBR", IsPBR);
DeclareProperty( "IsIdentityPBR", IsPBR);
DeclareProperty( "IsUniversalPBR", IsPBR);
DeclareProperty( "IsBipartitionPBR", IsPBR);
DeclareProperty( "IsTransformationPBR", IsPBR);
DeclareProperty( "IsPartialPermPBR", IsPBR);
DeclareProperty( "IsPermPBR", IsPBR);
DeclareProperty( "IsBlockBijectionPBR", IsPBR);
DeclareProperty( "IsDualTransformationPBR", IsPBR);
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