GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
# Create types PolymakeExternalObjectFamily := NewFamily( "ExternalPolymakeObjectFamily" ); ## Maybe this is the wrong place, but I need this category. ## If there is time, there need to be a new package created. DeclareCategory( "IsExternalObject", IsObject ); DeclareCategory( "IsExternalPolymakeObject", IsExternalObject ); DeclareCategory( "IsExternalPolymakeCone", IsExternalPolymakeObject ); DeclareCategory( "IsExternalPolymakeFan", IsExternalPolymakeObject ); DeclareCategory( "IsExternalPolymakePolytope", IsExternalPolymakeObject ); DeclareCategory( "IsExternalPolymakeTropicalHypersurface", IsExternalPolymakeObject ); DeclareCategory( "IsExternalPolymakeTropicalPolytope", IsExternalObject ); TheTypeExternalPolymakeObject := NewType( PolymakeExternalObjectFamily, IsExternalPolymakeObject ); TheTypeExternalPolymakeCone := NewType( PolymakeExternalObjectFamily, IsExternalPolymakeCone ); TheTypeExternalPolymakeFan := NewType( PolymakeExternalObjectFamily, IsExternalPolymakeFan ); TheTypeExternalPolymakePolytope := NewType( PolymakeExternalObjectFamily, IsExternalPolymakePolytope ); TheTypeExternalPolymakeTropicalHypersurface := NewType( PolymakeExternalObjectFamily, IsExternalPolymakeTropicalHypersurface ); TheTypeExternalPolymakeTropicalPolytope := NewType( PolymakeExternalObjectFamily, IsExternalPolymakeTropicalPolytope );