جلسه‌ی هجدهم

Let n be a positive integer and let S_n be the set of all nonnegative integers less than n which are relatively prime to n. we investigate structural properties of circulant graphs generated by the S_n’s and their complements. In particular, we classify all the graphs of these classes that are well-covered, Cohen–Macaulay, Buchsbaum or Gorenstein.