
 PlanetMath: idèle 
  is a discrete subgroup of the group of idèles 
  It is, however, possible to define a certain subgroup of the idèles (the subgroup of norm 1 elements) which does have compact quotient under 
  Crossreferences: subset, subspace topology, topology, ring, multiplicative, norm, quotient group, embedding, image, diagonal embedding, units, infinite primes, multiplicative groups, restricted direct product, subgroup, open, compact, group, group of units, completion, valuation ring, finite prime, number field 
 planetmath.org /encyclopedia/IdeleGroup.html (149 words) 
