“…We have already obtained uniqueness of the source term q(t) by using Banach fixed point theorem. v(x, t) can be proved by considering v 1 (x, t) and v 2 (x, t) as the two regular solution set of the ISP-II (1)-( 5) and (7), and finding them equal, that is, v 1 (x, t) = v 2 (x, t) by using the fact that bi-orthogonal systems of functions ( 14) form a complete set in L 2 ((0, 1)). □…”