“…is called a 2-inner product and (X, (·, · | ·)) a 2-inner product space ( [3]). These spaces are studied extensively in [1], [2], [4]- [6] and [11]. In [3] it is shown that x, z = (x, x | z) [9], has shown that for any 2−inner product space (X, (·, · | ·)) , x, z = (x, x | z)…”