Dear All, Developing an archiving routine for a GiNaC derived class I met the following problem. Some code (e.g. clifford.cpp) creates indexed objects with several dynamically created indexes labelled by new symbols with empty names. If such indexed objects are archived, then empty-named symbols are treated as identical and the restored object has a wrong number of indexes (only one). There is a line in void symbol::archive(archive_node &n) const, telling // XXX: we should not archive anonymous symbols. Shall this be fixed somehow? Best wishes, Vladimir -- Vladimir V. Kisil email: kisilv@maths.leeds.ac.uk www: http://www.maths.leeds.ac.uk/~kisilv/ Book: Geometry of Mobius Transformations http://www.worldscientific.com/worldscibooks/10.1142/p835