Author: Dzogchen Ponlop Rinpoche, Acharya Lama Tenpa Gyaltsen, and Acharya Kelsang Wangdi Translator: Karl Brunnhölzl

A root text written by Dzogchen Ponlop Rinpoche, Acharya Lama Tenpa Gyaltsen, and Acharya Kelsang Wangdi. It presents the divisions and definitions of the Vaibhashika and Sautrantika philosophical systems. Also available as an eBook for Apple or Android devices.