Ellipticity and Fredholmness of pseudo-differential operators on ℓ²(ℤⁿ)

Abstract
The minimal operator and the maximal operator of an elliptic pseudo-differential operator with symbols on Z(n) x T-n are proved to coincide and the domain is given in terms of a Sobolev space. Ellipticity and Fredholmness are proved to be equivalent for pseudo-differential operators on Z(n). The index of an elliptic pseudo-differential operator on Z(n) is also computed.
Funding Information
  • Science and Engineering Research Board (RP03890G, Odysseus 1 grant G.0H94.18N: Analysis and Partial Differential Equations, 01M01021)