The history of the Vedanta school is well-known since the time of Sankaracarya on, but its prehistory before Sankara is obscure. During the period, there appeared many philosophers and dogmaticians, but their thoughts were not clearly known. The book is an attempt to clear the details of the pre-Sankara Vedanta philosophy, utilizing Sanskrit materials, and Pali, Prakrit (Jain), as well as Tibetan and Chinese sources.
