Dipartimento di Matematica, Università di Torino, via Carlo Alberto 10, 10123 Torino, Italy
Abstract:
We are concerned with the so-called -pseudo-differential calculus. We describe the spectrum of the unital and commutative -algebra given by the norm closure of the space of -order pseudo-differential operators modulo compact operators; other related algebras are also considered. Finally, their -theory is computed.