
 IPN (Iranian Physics News) (Site not responding. Last check: 20071021) 
  The non trivial topologies, can not be foliated by a family of surfaces of constant time. 
  The trivial topology, periodically identified anti de Sitter space, fills in the torus, but so also do nontrivial topologies, the best known of which is Schwarzschild anti de Sitter. 
  The simplest topology that fits inside that boundary, is the trivial topology, S1 cross D3, the three disk. 
 ipn.persianblog.com /1383_5_ipn_archive.html (2933 words) 
