Commentaries and philosophical works based on the sūtras and their interpretation, including the traditional Tengyur section divisions of Perfection of Wisdom, Middle Way, Sūtra Commentary, and Mind Only (Toh 3786-4085)
The Indian treatises explaining and commenting on the various Perfection of Wisdom sūtras (Toh 3786-3823)
The treatises by Nāgārjuna, Āryaveva, Candrakīrti, Buddhapālita, Śāntideva, and other Indian masters on the Madhyamaka (Middle Way) philosophical system (Toh 3824-3980)
The Indian commentaries on a number of doctrinally important sūtras (other than those on the Perfection of Wisdom) (Toh 3981-4019)
The treatises by Maitreya, Asaṅga, Vasubandhu, and others on Yogācāra-Cittamātra themes, buddha-nature, and other topics (Toh 4020-4085)