change of address

Please send all further messages for me to Hagen, where I returned after six months at York. My internet address is: Reinhard.Boerger@Fernuni-Hagen.de My postal address is: Fachbereich Mathematik Fernuniversit"at Postfach 940 58084 Hagen Germany Please note the new postal code according to the new German system. I should appreciate if the other network participants in Germany also posted their new postal codes by the network. Greetings Reinhard B"orger +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++