“…A choice, introduced first by Kerner in [20,21] and further studied by Dubois-Violette [13,14] and Kapranov [18], is to fix a primitive N -th root of unity q and define a q-differential graded algebra A to be a Zgraded associative algebra together with a linear operator d : A −→ A of degree one such that d(ab) = d(a)b + qāad(b) and d N = 0. There are several interesting examples and constructions of q-differential graded algebras [1,2,6,8,9,15,16,19,21].…”