“…It is easy to check that with the trivial choice a = b = c = d = q, ω π (q, q, q, q) = q |π| , the 4parameter generating functions become the generating function for the number of partitions and number of partitions into distinct parts, respectively. The choice (a, b, c, d) = (q, q, 1, 1), proves Schmidt problem and yields another similar theorem of the sort for ordinary partitions: Theorem 1.2 (Theorems 1.3 and 6.3 [19]).…”