In this paper, we will use techniques of noncommutative projective geometry to construct
examples of algebras R over a field k not satisfying the following two types of symmetric …

In this paper, we will use techniques of noncommutative projective geometry to construct
examples of algebras R over a field k not satisfying the following two types of symmetric …

(M, N), Exti R (M, N)= 0 for all i≫ 0 if and only if Exti R (N, M)= 0 for all i≫ 0. In particular, and
contrary to the commutative case, we give a simple example of a noncommutative …