Baudhayana sutras
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The Baudhāyana sūtras (Sanskrit: बौधायन) are a group of
The Baudhayana sūtras consist of six texts:
- the Śrautasûtra, probably in 19 Praśnas (questions),
- the Karmāntasûtra in 20 Adhyāyas (chapters),
- the Dwaidhasûtra in 4 Praśnas,
- the Grihyasutrain 4 Praśnas,
- the Dharmasûtrain 4 Praśnas and
- the
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.[3]
Baudhāyana Shrautasūtra
Baudhāyana Dharmasūtra
The Dharmasūtra of Baudhāyana like that of
There are no commentaries on this Dharmasūtra with the exception of Govindasvāmin's Vivaraṇa. The date of the commentary is uncertain but according to Olivelle it is not very ancient. Also the commentary is inferior in comparison to that of Haradatta on Āpastamba and Gautama.[5]
This Dharmasūtra is divided into four books. Olivelle states that Book One and the first sixteen chapters of Book Two are the 'Proto-Baudhayana'[4] even though this section has undergone alteration. Scholars like Bühler and Kane agree that the last two books of the Dharmasūtra are later additions. Chapter 17 and 18 in Book Two lays emphasis on various types of ascetics and acetic practices.[4]
The first book is primarily devoted to the student and deals in topics related to studentship. It also refers to social classes, the role of the king, marriage, and suspension of Vedic recitation. Book two refers to penances, inheritance, women, householder, orders of life, ancestral offerings. Book three refers to holy householders, forest hermit and penances. Book four primarily refers to the yogic practices and penances along with offenses regarding marriage.[6]
Baudhāyana Śulvasūtra
Pythagorean theorem
The Baudhāyana Śulvasūtra states the rule referred to today in most of the world as the
दीर्घचतुरस्रस्याक्ष्णया रज्जुः पार्श्वमानी तिर्यग् मानी च यत् पृथग् भूते कुरूतस्तदुभयं करोति ॥
dīrghachatursrasyākṣaṇayā rajjuḥ pārśvamānī, tiryagmānī,
cha yatpṛthagbhūte kurutastadubhayāṅ karoti.
- The diagonal of an oblong produces by itself both the areas which the two sides of the oblong produce separately.
The diagonal and sides referred to are those of a rectangle (oblong), and the areas are those of the squares having these line segments as their sides. Since the diagonal of a rectangle is the hypotenuse of the right triangle formed by two adjacent sides, the statement is seen to be equivalent to the Pythagorean theorem.[8]
Baudhāyana also provides a statement using a rope measure of the reduced form of the Pythagorean theorem for an isosceles right triangle:
- The cord which is stretched across a square produces an area double the size of the original square.
Circling the square
Another problem tackled by Baudhāyana is that of finding a circle whose area is the same as that of a square (the reverse of squaring the circle). His sūtra i.58 gives this construction:
- Draw half its diagonal about the centre towards the East–West line; then describe a circle together with a third part of that which lies outside the square.
Explanation:[9]
- Draw the half-diagonal of the square, which is larger than the half-side by .
- Then draw a circle with radius , or , which equals .
- Now , so the area .
Square root of 2
Baudhāyana i.61-2 (elaborated in Āpastamba Sulbasūtra i.6) gives the length of the diagonal of a square in terms of its sides, which is equivalent to a formula for the square root of 2:
- samasya dvikaraṇī. pramāṇaṃ tṛtīyena vardhayet
tac caturthenātmacatustriṃśonena saviśeṣaḥ
- The diagonal [lit. "doubler"] of a square. The measure is to be increased by a third and by a fourth decreased by the 34th. That is its diagonal approximately.[citation needed]
That is,
which is correct to five decimals.[10]
Other theorems include: diagonals of rectangle bisect each other, diagonals of rhombus bisect at right angles, area of a square formed by joining the middle points of a square is half of original, the midpoints of a rectangle joined forms a rhombus whose area is half the rectangle, etc.
Note the emphasis on rectangles and squares; this arises from the need to specify yajña bhūmikās—i.e. the altar on which rituals were conducted, including fire offerings (yajña).
See also
Notes
- Āpastamba, which is dated by Robert Lingatto the sutra period proper, between c. 500 to 200 BCE. Robert Lingat, The Classical Law of India, (Munshiram Manoharlal Publishers Pvt Ltd, 1993), p. 20
- ^ Sacred Books of the East, vol.14 – Introduction to Baudhayana
- ^ Nanda, Meera (16 September 2016). "Hindutva's science envy". Frontline. Archived from the original on 17 July 2017. Retrieved 14 October 2016.
- ^ a b c Patrick Olivelle, Dharmasūtras: The Law Codes of Ancient India, (Oxford World Classics, 1999), p. 127
- ^ Patrick Olivelle, Dharmasūtras: The Law Codes of Ancient India, (Oxford World Classics, 1999), p. xxxi
- ^ Patrick Olivelle, Dharmasūtras: The Law Codes of Ancient India, (Oxford World Classics, 1999), pp. 128–131
- ^ *Høyrup, Jens (1998). "Pythagorean 'Rule' and 'Theorem' – Mirror of the Relation Between Babylonian and Greek Mathematics". In Renger, Johannes (ed.). Babylon: Focus mesopotamischer Geschichte, Wiege früher Gelehrsamkeit, Mythos in der Moderne. 2. Internationales Colloquium der Deutschen Orient-Gesellschaft 24.–26. März 1998 in Berlin (PDF). Berlin: Deutsche Orient-Gesellschaft / Saarbrücken: SDV Saarbrücker Druckerei und Verlag. pp. 393–407.
- ^ The English translation comes from George Thibaut's series of articles in The Pandit. (See References.) The translated passage is on page 298, volume 9. Thibaut remarks, "We should of course say 'rectangular triangles' instead of 'oblongs'. The length of the diagonals of these oblongs or of the hypotenuses of these rectangular triangles is not explicitly mentioned by Baudháyana. Ápastamba states it, when describing the different manners of constructing the vedi."
- ^ * O'Connor, John J.; Robertson, Edmund F., "The Indian Sulbasutras", MacTutor History of Mathematics Archive, University of St Andrews St Andrews University, 2000.
- ^ O'Connor, "Baudhayana".
References
- "The Śulvasútra of Baudháyana, with the commentary by Dvárakánáthayajvan", translated by George Thibaut, was published in a series of issues of The Pandit. A Monthly Journal, of the Benares College, devoted to Sanskrit Literature:
- (1875) 9 (108): 292–298
- (1875–1876) 10 (109): 17–22, (110): 44–50, (111): 72–74, (114): 139–146, (115): 166–170, (116): 186–194, (117): 209–218
- (new series) (1876–1877) 1 (5): 316–322, (9): 556–578, (10): 626–642, (11): 692–706, (12): 761–770
- George Gheverghese Joseph. The Crest of the Peacock: Non-European Roots of Mathematics, 2nd Edition. ISBN 0-14-027778-1.
- Vincent J. Katz. A History of Mathematics: An Introduction, 2nd Edition. ISBN 0-321-01618-1
- ISBN 81-900962-0-6
- O'Connor, John J.; St Andrews University, 2000.
- Ian G. Pearce. Sulba Sutras at the MacTutor archive. St Andrews University, 2002.
- B.B. Dutta."The Science of the Shulba".