P. Salmon (Ed.) Categories and Commutative Algebra Lectures given at a Summer School o f the Centro Internazionale Matematico Estivo (C.I.M.E.), held in Varenna (Como), Italy, September 12-21, 1971 C.I.M.E. Foundation c/o Dipartimento di Matematica “U. Dini” Viale Morgagni n. 67/a 50134 Firenze Italy [email protected] ISBN 978-3-642-10978-2 e-ISBN: 978-3-642-10979-9 DOI:10.1007/978-3-642-10979-9 Springer Heidelberg Dordrecht London New York ©Springer-Verlag Berlin Heidelberg 2010 Reprint of the 1ste d. C.I.M.E., Ed. Cremonese, Rom a 1973 With kind permission of C.I.M.E. Printed on acid-free paper Springer.com