Baudhayana sutras

The Baudhāyana sūtras (Sanskrit: बौधायन सूत्रस् ) are a group of Vedic Sanskrit texts which cover dharma, daily ritual, mathematics and is one of the oldest Dharma-related texts of Hinduism that have survived into the modern age from the 1st-millennium BCE. They belong to the Taittiriya branch of the Krishna Yajurveda school and are among the earliest texts of the genre.

The Baudhayana sūtras consist of six texts:

1. the Śrautasûtra, probably in 19 Praśnas (questions),
2. the Karmāntasûtra in 20 Adhyāyas (chapters),
3. the Dwaidhasûtra in 4 Praśnas,
4. the Grihyasutra in 4 Praśnas,
5. the Dharmasûtra in 4 Praśnas and
6. the Śulbasûtra in 3 Adhyāyas.

The Baudhāyana Śulbasûtra is noted for containing several early mathematical results, including an approximation of the square root of 2 and the statement of the Pythagorean theorem.