##
InstallMethod( ViewObj, 
               "for an external polymake object",
               [ IsExternalPolymakeObject ],
  function( r )
    
    Print( "<an external polymake object>" );
    
end );

##
InstallMethod( ViewObj, 
               "for an external polymake object",
               [ IsExternalPolymakeCone ],
  function( r )
    
    Print( "<an external polymake cone>" );
    
end );

##
InstallMethod( ViewObj, 
               "for an external polymake object",
               [ IsExternalPolymakePolytope ],
  function( r )
    
    Print( "<an external polymake polytope>" );
    
end );

##
InstallMethod( ViewObj, 
               "for an external polymake object",
               [ IsExternalPolymakeFan ],
  function( r )
    
    Print( "<an external polymake fan>" );
    
end );

##
InstallMethod( ViewObj, 
               "for an external polymake object",
               [ IsExternalPolymakeTropicalHypersurface ],
  function( r )
    
    Print( "<an external polymake tropical hypersurface>" );
    
end );

##
InstallMethod( ViewObj, 
               "for an external polymake object",
               [ IsExternalPolymakeTropicalPolytope ],
  function( r )
    
    Print( "<an external polymake tropical polytope>" );
    
end );

##
InstallMethod( Display, 
               "for an external polymake object",
               [ IsExternalPolymakeObject ],
  function( r )
    
    Print( "An external polymake object.\n" );
    
end );

##
InstallMethod( Display, 
               "for an external polymake object",
               [ IsExternalPolymakeCone ],
  function( r )
    
    Print( "An external polymake cone.\n" );
    
end );

##
InstallMethod( Display, 
               "for an external polymake object",
               [ IsExternalPolymakePolytope ],
  function( r )
    
    Print( "An external polymake polytope.\n" );
    
end );

##
InstallMethod( Display, 
               "for an external polymake object",
               [ IsExternalPolymakeTropicalHypersurface ],
  function( r )
    
    Print( "An external polymake tropical hypersurface.\n" );
    
end );

##
InstallMethod( Display, 
               "for an external polymake object",
               [ IsExternalPolymakeTropicalPolytope ],
  function( r )
    
    Print( "An external polymake tropical polytope.\n" );
    
end );

##
InstallMethod( Display, 
               "for an external polymake object",
               [ IsExternalPolymakeFan ],
  function( r )
    
    Print( "An external polymake fan.\n" );
    
end );