∑y=0∞(1-q2⁢y⁢a-2)⁢(a-2,(a⁢b)-1;q)y(1-a-2)⁢(q,b⁢q⁢a-1;q)y⁢(b⁢a-1)y⁢qy2⁢Qn⁡(12⁢(a⁢q-y+a-1⁢qy);a,b| q-1)⁢Qm⁡(12⁢(a⁢q-y+a-1⁢qy);a,b| q-1)=(q⁢a-2;q)∞(b⁢a-1⁢q;q)∞⁢(q,(a⁢b)-1;q)n⁢(a⁢b)n⁢q-n2⁢δn,m.