“…Some words about the generality of skew PBW extensions with respect to another families of noncommutative rings are said in Section 1. Homological and ring-theoretical properties for these extensions have been investigated by several people (e.g., Artamonov [2], Hashemi et al, [17], [18], [19], and [20], Lezama et al, [1], [24], [29], [31], [33], [35], Louzari et al, [37], Tumwesigye et al, [61], Zambrano [62], and the authors, [42], [43], [48], [51], [52] and [55]). As a matter of fact, a book containing research results about these extensions has recently been published, see [10].…”