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##
##  Basic.gd                    MatricesForHomalg package    Mohamed Barakat
##
##  Copyright 2007-2008 Lehrstuhl B für Mathematik, RWTH Aachen
##
##  Declarations of homalg basic procedures.
##
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####################################
#
# global functions and operations:
#
####################################

# basic operations:

DeclareOperation( "BasisOfRows",
        [ IsHomalgMatrix ] );

DeclareOperation( "BasisOfRows",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "BasisOfColumns",
        [ IsHomalgMatrix ] );

DeclareOperation( "BasisOfColumns",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

## this implicitly declares [ IsHomalgMatrix, IsHomalgMatrix ]
DeclareOperation( "DecideZero",
        [ IsRingElement, IsHomalgMatrix ] );

DeclareOperation( "DecideZero",
        [ IsRingElement, IsHomalgRingRelations ] );

DeclareOperation( "DecideZero",
        [ IsHomalgMatrix, IsList ] );

DeclareOperation( "DecideZero",
        [ IsHomalgMatrix ] );

DeclareOperation( "SyzygiesOfRows",
        [ IsHomalgMatrix ] );

DeclareOperation( "SyzygiesOfRows",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "LazySyzygiesOfRows",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "SyzygiesOfColumns",
        [ IsHomalgMatrix ] );

DeclareOperation( "SyzygiesOfColumns",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "LazySyzygiesOfColumns",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "ReducedSyzygiesOfRows",
        [ IsHomalgMatrix ] );

DeclareOperation( "ReducedSyzygiesOfRows",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "ReducedSyzygiesOfColumns",
        [ IsHomalgMatrix ] );

DeclareOperation( "ReducedSyzygiesOfColumns",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "SyzygiesBasisOfRows",
        [ IsHomalgMatrix ] );

DeclareOperation( "SyzygiesBasisOfColumns",
        [ IsHomalgMatrix ] );

DeclareOperation( "SyzygiesBasisOfRows",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "SyzygiesBasisOfColumns",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "RightDivide",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "LeftDivide",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "RightDivide",
        [ IsHomalgMatrix, IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "LeftDivide",
        [ IsHomalgMatrix, IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "GenerateSameRowModule",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

DeclareOperation( "GenerateSameColumnModule",
        [ IsHomalgMatrix, IsHomalgMatrix ] );

# global functions:

DeclareGlobalFunction( "BestBasis" );

DeclareGlobalFunction( "SimplerEquivalentMatrix" );