Abstract: The great-celebrated theorem due to Jordan and Von-Neumann had revealed that an inner product could be obtained from a norm provided the norm satisfies the parallelogram law. We have also studied some other related theorems and corollaries deduced from Jordan and Von-Neumann.
Md. Shahjahan Ali and Md.Rezaul Karim , 2005. Characterizations of Inner Product Spaces in Terms of Normed Linear Spaces . Asian Journal of Information Technology, 4: 711-714.