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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.