# Mahāvīra (mathematician)

Mahāvīra
Born India
Occupation Mathematician
Religion Jainism

Mahāvīra (or Mahaviracharya, "Mahavira the Teacher") was a 9th-century Jain mathematician from Bihar, India.[1][2][3] He was the author of Gaṇitasārasan̄graha (or Ganita Sara Samgraha, c. 850), which revised the Brāhmasphuṭasiddhānta.[1] He was patronised by the Rashtrakuta king Amoghavarsha.[4] He separated astrology from mathematics. It is the earliest Indian text entirely devoted to mathematics.[5] He expounded on the same subjects on which Aryabhata and Brahmagupta contended, but he expressed them more clearly. His work is a highly syncopated approach to algebra and the emphasis in much of his text is on developing the techniques necessary to solve algebraic problems.[6] He is highly respected among Indian mathematicians, because of his establishment of terminology for concepts such as equilateral, and isosceles triangle; rhombus; circle and semicircle.[7] Mahāvīra's eminence spread in all South India and his books proved inspirational to other mathematicians in Southern India.[8] It was translated into Telugu language by Pavuluri Mallana as Saar Sangraha Ganitam.[9]

He discovered algebraic identities like a3=a(a+b)(a-b) +b2(a-b) + b3.[3] He also found out the formula for nCr as [n(n-1)(n-2)...(n-r+1)]/r(r-1)(r-2)...2*1.[10] He devised formula which approximated area and perimeters of ellipses and found methods to calculate the square of a number and cube roots of a number.[11] He asserted that the square root of a negative number did not exist.[12]

## Rules for decomposing fractions

Mahāvīra's Gaṇita-sāra-saṅgraha gave systematic rules for expressing a fraction as the sum of unit fractions.[13] This follows the use of unit fractions in Indian mathematics in the Vedic period, and the Śulba Sūtras' giving an approximation of √2 equivalent to .[13]

In the Gaṇita-sāra-saṅgraha (GSS), the second section of the chapter on arithmetic is named kalā-savarṇa-vyavahāra (lit. "the operation of the reduction of fractions"). In this, the bhāgajāti section (verses 55–98) gives rules for the following:[13]

• To express 1 as the sum of n unit fractions (GSS kalāsavarṇa 75, examples in 76):[13]
rūpāṃśakarāśīnāṃ rūpādyās triguṇitā harāḥ kramaśaḥ /

dvidvitryaṃśābhyastāv ādimacaramau phale rūpe //

When the result is one, the denominators of the quantities having one as numerators are [the numbers] beginning with one and multiplied by three, in order. The first and the last are multiplied by two and two-thirds [respectively].
• To express 1 as the sum of an odd number of unit fractions (GSS kalāsavarṇa 77):[13]
• To express a unit fraction as the sum of n other fractions with given numerators (GSS kalāsavarṇa 78, examples in 79):
• To express any fraction as a sum of unit fractions (GSS kalāsavarṇa 80, examples in 81):[13]
Choose an integer i such that is an integer r, then write
and repeat the process for the second term, recursively. (Note that if i is always chosen to be the smallest such integer, this is identical to the greedy algorithm for Egyptian fractions.)
• To express a unit fraction as the sum of two other unit fractions (GSS kalāsavarṇa 85, example in 86):[13]
where is to be chosen such that is an integer (for which must be a multiple of ).
• To express a fraction as the sum of two other fractions with given numerators and (GSS kalāsavarṇa 87, example in 88):[13]
where is to be chosen such that divides

Some further rules were given in the Gaṇita-kaumudi of Nārāyaṇa in the 14th century.[13]

## Notes

1. Tabak 2009, p. 42.
2. Puttaswamy 2012, p. 231.
3. The Math Book: From Pythagoras to the 57th Dimension, 250 Milestones in the ... by Clifford A. Pickover: page 88
4. Algebra: Sets, Symbols, and the Language of Thought by John Tabak: p.43
5. Geometry in Ancient and Medieval India by T. A. Sarasvati Amma: page 122
6. Census of the Exact Sciences in Sanskrit by David Pingree: page 388
7. Tabak 2009, p. 43.
8. Krebs 2004, p. 132.
9. Selin 2008, p. 1268.
10. Kusuba 2004, pp. 497–516