IMAR Preprint Series
These notes were written, mainly in the late seventies, with the purpose to develop a detailed self-contained introduction to the theory of operator algebras.They are conceived also as a reference text, containing all details we could track down in the literature on each treated subject item. The original version was used for about 20 years by the Romanian school of operator algebras in Bucharest. In 1995 it was multiplied in the frame of the series “Monografii Matematice” of the University of Timișoara, but these copies have been shortly out of stock. Several appeals we got from colleagues to publish these notes convinced us to reasonably update and make them again available to a larger audience.