Harish Chandra Rajpoot is a B. Tech. student of Mechanical Engineering at Madan Mohan Malaviya University of Technology (Formerly M.M.M. Engineering College), Gorakhpur (UP) India. He did his high school from D.A.V. Inter College, Mahoba (UP) India & Intermediate from Oxford Model Inter College, Syam Nagar, Kanpur (UP) India. He made his best efforts more than two years for this academic research in Applied Physics based on mathematical derivations & formulations. He derived a formula on permutations of alphabetic words, positive integral numbers & all other linear permutations,. It had been certified by International Journal of Mathematics & Physical Sciences Research. Manuscript ID: 004022014A. Consequently, he, using his formula, proved that factorial of any natural number can be expanded as the sum of finite terms. This expansion named as 'HCR's Series'
He had been taught, guided & inspired by his renowned & well experienced teacher of Physics Mr Upendra Sir @ Oxford Model I. C. Kanpur. He wrote his first book Advanced Geometry based on research articles in Applied Mathematics & Radiometry for higher education which was first published by Notion Press, Chennai, India.