Prasthana Trayam - Brahma Vidya

Three sources of  axioms with  epistemic authority, for the Vedanta schools. 

They are: 

The Upanishads, known as Upadeśa Prasthāna (injunctive texts), and the Śruti Prasthāna (the starting point for axioms of revelation), especially the Principal Upanishads.

The Bhagavad Gita, known as Sādhana Prasthāna (practical text), and the Smṛti Prasthāna (the starting point for axioms of remembered tradition)

The Brahma Sutras, known as Sūtra Prasthāna (formulative texts) or Nyāya Prasthāna or Yukti Prasthāna (logical text for axioms of logic)

The ten Upanishads are 

Īśā, 

Kena, 

Kaṭha,

 Praṣna, 

Muṇḍaka, 

Māṇḍūkya, 

Taittirīya, 

Aitareya, 

Chāndogya 

Bṛhadāraṇyaka.

Aitareya, 

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Bṛhadāraṇyaka.

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Chāndogya 

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Īśā, 

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Kaṭha,

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Kena, 

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Māṇḍūkya, 

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Muṇḍaka, 

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 Praṣna, 

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Taittirīya, 

https://estudantedavedanta.net/Taittiriya%20Upanishad%20-%20Swami%20Sarvanand%20[Sanskrit-English].pdf

https://archive.org/details/AitareyataittiriyaUpanishadsWithShankaraBhashya-English

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Brahma Sutras

1

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