Brahmagupta

Brahmagupta ( – ) was an Indian mathematician and astronomer. He is the author of two early works on mathematics and astronomy: the ''Brāhmasphuṭasiddhānta'' (BSS, "correctly established doctrine of Brahma", dated 628), a theoretical treatise, and the '' Khaṇḍakhādyaka'' ("edible bite", dated 665), a more practical text.

Brahmagupta was the first to give rules for computing with ''zero''. The texts composed by Brahmagupta were in elliptic verse in Sanskrit, as was common practice in Indian mathematics. As no proofs are given, it is not known how Brahmagupta's results were derived.

In 628 CE, Brahmagupta first described gravity as an attractive force, and used the term "gurutvākarṣaṇam (गुरुत्वाकर्षणम्)" in Sanskrit to describe it.

Life and career

Brahmagupta was born in 598 CE according to his own statement. He lived in ''Bhillamāla'' in Gurjaradesa (modern Bhinmal in Rajasthan, India) during the reign of the Chavda dynasty ruler, Vyagrahamukha. He was the son of Jishnugupta and was a Hindu by religion, in particular, a Shaivite.: "Brahmagupta, one of the most celebrated mathematicians of the East, indeed of the world, was born in the year 598 CE, in the town of Bhillamala during the reign of King Vyaghramukh of the Chapa Dynasty." He lived and worked there for a good part of his life. Prithudaka Svamin, a later commentator, called him ''Bhillamalacharya'', the teacher from Bhillamala.

Bhillamala was the capital of the Gurjaradesa, the second-largest kingdom of Western India, comprising southern Rajasthan and northern Gujarat in modern-day India. It was also a centre of learning for mathematics and astronomy. He became an astronomer of the ''Brahmapaksha'' school, one of the four major schools of Indian astronomy during this period. He studied the five traditional '' Siddhantas'' on Indian astronomy as well as the work of other astronomers including Aryabhata I, Latadeva, Pradyumna, Varahamihira, Simha, Srisena, Vijayanandin and Vishnuchandra.

In the year 628, at the age of 30, he composed the ''Brāhmasphuṭasiddhānta'' ("improved treatise of Brahma") which is believed to be a revised version of the received ''Siddhanta'' of the ''Brahmapaksha'' school of astronomy. Scholars state that he incorporated a great deal of originality into his revision, adding a considerable amount of new material. The book consists of 24 chapters with 1008 verses in the ārya metre. A good deal of it is astronomy, but it also contains key chapters on mathematics, including algebra, geometry, trigonometry and algorithmics, which are believed to contain new insights due to Brahmagupta himself.

Later, Brahmagupta moved to Ujjaini, Avanti, a major centre for astronomy in central India. At the age of 67, he composed his next well-known work ''Khanda-khādyaka'', a practical manual of Indian astronomy in the ''karana'' category meant to be used by students.

Brahmagupta died in 668 CE, and he is presumed to have died in Ujjain.

Works

Brahmagupta composed the following treatises:

* ''Brāhmasphuṭasiddhānta'', composed in 628 CE.
* ''Khaṇḍakhādyaka'', composed in 665 CE.
* ''Grahaṇārkajñāna'', (ascribed in one manuscript)

Reception

Brahmagupta's mathematical advances were carried on further by Bhāskara II, a lineal descendant in Ujjain, who described Brahmagupta as the ''ganaka-chakra-chudamani'' (the gem of the circle of mathematicians). Prithudaka Svamin wrote commentaries on both of his works, rendering difficult verses into simpler language and adding illustrations. Lalla and Bhattotpala in the 8th and 9th centuries wrote commentaries on the ''Khanda-khadyaka''. Further commentaries continued to be written into the 12th century.

A few decades after the death of Brahmagupta, Sindh came under the Arab Caliphate in 712 CE. Expeditions were sent into ''Gurjaradesa'' ("''Al-Baylaman'' in ''Jurz''", as per Arab historians). The kingdom of Bhillamala seems to have been annihilated but Ujjain repulsed the attacks. The court of Caliph Al-Mansur (754–775) received an embassy from Sindh, including an astrologer called Kanaka, who brought (possibly memorised) astronomical texts, including those of Brahmagupta. Brahmagupta's texts were translated into Arabic by Muhammad al-Fazari, an astronomer in Al-Mansur's court ,under the names ''Sindhind'' and ''Arakhand''. An immediate outcome was the spread of the decimal number system used in the texts. The mathematician Al-Khwarizmi (800–850 CE) wrote a text called ''al-Jam wal-tafriq bi hisal-al-Hind'' (Addition and Subtraction in Indian Arithmetic), which was translated into Latin in the 13th century as ''Algorithmi de numero indorum''. Through these texts, the decimal number system and Brahmagupta's algorithms for arithmetic have spread throughout the world. Al-Khwarizmi also wrote his own version of ''Sindhind'', drawing on Al-Fazari's version and incorporating Ptolemaic elements. Indian astronomic material circulated widely for centuries, even making its way into medieval Latin texts.

The historian of science George Sarton called Brahmagupta "one of the greatest scientists of his race and the greatest of his time."

Mathematics

Algebra

Brahmagupta gave the solution of the general linear equation in chapter eighteen of ''Brahmasphuṭasiddhānta'',

The difference between ''rupas'', when inverted and divided by the difference of the oefficientsof the nknowns is the unknown in the equation. The ''rupas'' are ubtracted on the sidebelow that from which the square and the unknown are to be subtracted.

which is a solution for the equation where ''rupas'' refers to the constants and . The solution given is equivalent to .

He further gave two equivalent solutions to the general quadratic equation

18.44. Diminish by the middle umberthe square-root of the ''rupas'' multiplied by four times the square and increased by the square of the middle umber divide the remainder by twice the square. he result isthe middle umber

18.45. Whatever is the square-root of the ''rupas'' multiplied by the square ndincreased by the square of half the unknown, diminished that by half the unknown nddivide he remainderby its square. he result isthe unknown.

which are, respectively, solutions for the equation equivalent to,

:$x = \frac$

and

:$x = \frac$

He went on to solve systems of simultaneous indeterminate equations stating that the desired variable must first be isolated, and then the equation must be divided by the desired variable's coefficient. In particular, he recommended using "the pulverizer" to solve equations with multiple unknowns.

18.51. Subtract the colors different from the first color. he remainderdivided by the first olor's coefficientis the measure of the first. ermstwo by two reconsidered hen reduced tosimilar divisors, nd so onrepeatedly. If there are many olors the pulverizer s to be used

Like the algebra of Diophantus, the algebra of Brahmagupta was syncopated. Addition was indicated by placing the numbers side by side, subtraction by placing a dot over the subtrahend, and division by placing the divisor below the dividend, similar to our notation but without the bar. Multiplication, evolution, and unknown quantities were represented by abbreviations of appropriate terms. "he was the first one to give a ''general'' solution of the linear Diophantine equation ''ax'' + ''by'' = ''c'', where ''a'', ''b'', and ''c'' are integers. ..It is greatly to the credit of Brahmagupta that he gave ''all'' integral solutions of the linear Diophantine equation, whereas Diophantus himself had been satisfied to give one particular solution of an indeterminate equation. Inasmuch as Brahmagupta used some of the same examples as Diophantus, we see again the likelihood of Greek influence in India – or the possibility that they both made use of a common source, possibly from Babylonia. It is interesting to note also that the algebra of Brahmagupta, like that of Diophantus, was syncopated. Addition was indicated by juxtaposition, subtraction by placing a dot over the subtrahend, and division by placing the divisor below the dividend, as in our fractional notation but without the bar. The operations of multiplication and evolution (the taking of roots), as well as unknown quantities, were represented by abbreviations of appropriate words." The extent of Greek influence on this syncopation, if any, is not known and it is possible that both Greek and Indian syncopation may be derived from a common Babylonian source.

Arithmetic

The four fundamental operations (addition, subtraction, multiplication, and division) were known to many cultures before Brahmagupta. This current system is based on the Hindu–Arabic numeral system and first appeared in the ''Brāhmasphuṭasiddhānta''. Brahmagupta describes multiplication in the following way:

The multiplicand is repeated like a string for cattle, as often as there are integrant portions in the multiplier and is repeatedly multiplied by them and the products are added together. It is multiplication. Or the multiplicand is repeated as many times as there are component parts in the multiplier.

Indian arithmetic was known in Medieval Europe as ''modus Indorum'' meaning "method of the Indians". In the ''Brāhmasphuṭasiddhānta'', four methods for multiplication were described, including ''gomūtrikā'', which is said to be close to the present day methods. In the beginning of chapter twelve of his ''Brāhmasphuṭasiddhānta'', entitled "Calculation", he also details operations on fractions. The reader is expected to know the basic arithmetic operations as far as taking the square root, although he explains how to find the cube and cube-root of an integer and later gives rules facilitating the computation of squares and square roots. He then gives rules for dealing with five types of combinations of fractions: ; ; ; ; and .

Series

Brahmagupta then goes on to give the sum of the squares and cubes of the first integers.

12.20. The sum of the squares is that ummultiplied by twice the umber ofstep increased by one nddivided by three. The sum of the cubes is the square of that umPiles of these with identical balls an also be computed

Here Brahmagupta found the result in terms of the ''sum'' of the first integers, rather than in terms of as is the modern practice. Here the sums of the squares and cubes of the first ''n'' integers are defined in terms of the sum of the ''n'' integers itself;

He gives the sum of the squares of the first natural numbers as and the sum of the cubes of the first n natural numbers as .

Zero

Brahmagupta's ''Brahmasphuṭasiddhānta'' is the first book that provides rules for arithmetic manipulations that apply to zero and to negative numbers. The ''Brāhmasphuṭasiddhānta'' is the earliest known text to treat zero as a number in its own right, rather than as simply a placeholder digit in representing another number as was done by the Babylonians or as a symbol for lack of quantity as was done by Ptolemy and the Romans. In chapter eighteen of his ''Brāhmasphuṭasiddhānta'', Brahmagupta describes operations on negative numbers. He first describes addition and subtraction,

18.30. he sumof two positives is positives, of two negatives negative; of a positive and a negative he sumis their difference; if they are equal it is zero. The sum of a negative and zero is negative, hatof a positive and zero positives, nd thatof two zeros zero.

..br />
18.32. A negative minus zero is negative, a positive inus zerois positive; zero inus zerois zero. When a positive is to be subtracted from a negative or a negative from a positive, then it is to be added.

He goes on to describe multiplication,

18.33. The product of a negative and a positive is negative, of two negatives positive, and of positives positive; the product of zero and a negative, of zero and a positive, or of two zeros is zero.

But his description of division by zero differs from our modern understanding:

18.34. A positive divided by a positive or a negative divided by a negative is positive; a zero divided by zero is zero; a positive divided by a negative is negative; a negative divided by a positive is lsonegative.

18.35. A negative or a positive divided by zero has that eroas its divisor, or zero divided by a negative or a positive as that negative or positive as its divisor The square of a negative or positive is positive; he squareof zero is zero. That of which he squareis the square is tssquare root.

Here Brahmagupta states that = 0 and as for the question of where ≠ 0 he did not commit himself.: However, here again Brahmagupta spoiled matters somewhat by asserting that 0 ÷ 0 = 0, and on the touchy matter of ''a'' ÷ 0, he did not commit himself. His rules for arithmetic on negative numbers and zero are quite close to the modern understanding, except that in modern mathematics division by zero is left undefined.

Diophantine analysis

Pythagorean triplets

In chapter twelve of his ''Brāhmasphuṭasiddhānta'', Brahmagupta provides a formula useful for generating Pythagorean triples:

12.39. The height of a mountain multiplied by a given multiplier is the distance to a city; it is not erased. When it is divided by the multiplier increased by two it is the leap of one of the two who make the same journey.

Or, in other words, if , then a traveller who "leaps" vertically upwards a distance from the top of a mountain of height , and then travels in a straight line to a city at a horizontal distance from the base of the mountain, travels the same distance as one who descends vertically down the mountain and then travels along the horizontal to the city. Stated geometrically, this says that if a right-angled triangle has a base of length and altitude of length , then the length, , of its hypotenuse is given by . And, indeed, elementary algebraic manipulation shows that whenever has the value stated. Also, if and are rational, so are , , and . A Pythagorean triple can therefore be obtained from , and by multiplying each of them by the least common multiple of their denominators.

Pell's equation

Brahmagupta went on to give a recurrence relation for generating solutions to certain instances of Diophantine equations of the second degree such as (called Pell's equation) by using the Euclidean algorithm. The Euclidean algorithm was known to him as the "pulverizer" since it breaks numbers down into ever smaller pieces.

The nature of squares:
18.64. ut downtwice the square-root of a given square by a multiplier and increased or diminished by an arbitrary umber The product of the first air multiplied by the multiplier, with the product of the last air is the last computed.
18.65. The sum of the thunderbolt products is the first. The additive is equal to the product of the additives. The two square-roots, divided by the additive or the subtractive, are the additive ''rupas''.

The key to his solution was the identity,

:$(x^2_1 - Ny^2_1)(x^2_2 - Ny^2_2) = (x_1 x_2 + Ny_1 y_2)^2 - N(x_1 y_2 + x_2 y_1)^2$

which is a generalisation of an identity that was discovered by Diophantus,

:$(x^2_1 - y^2_1)(x^2_2 - y^2_2) = (x_1 x_2 + y_1 y_2)^2 - (x_1 y_2 + x_2 y_1)^2.$

Using his identity and the fact that if and are solutions to the equations and , respectively, then is a solution to , he was able to find integral solutions to Pell's equation through a series of equations of the form . Brahmagupta was not able to apply his solution uniformly for all possible values of , rather he was only able to show that if has an integer solution for = ±1, ±2, or ±4, then has a solution. The solution of the general Pell's equation would have to wait for Bhāskara II in .

Geometry

Brahmagupta's formula

Brahmagupta's most famous result in geometry is his formula for cyclic quadrilaterals. Given the lengths of the sides of any cyclic quadrilateral, Brahmagupta gave an approximate and an exact formula for the figure's area,

12.21. The approximate area is the product of the halves of the sums of the sides and opposite sides of a triangle and a quadrilateral. The accurate reais the square root from the product of the halves of the sums of the sides diminished by achside of the quadrilateral.

So given the lengths , , and of a cyclic quadrilateral, the approximate area is while, letting , the exact area is

: .

Although Brahmagupta does not explicitly state that these quadrilaterals are cyclic, it is apparent from his rules that this is the case. Heron's formula is a special case of this formula and it can be derived by setting one of the sides equal to zero.

Triangles

Brahmagupta dedicated a substantial portion of his work to geometry. One theorem gives the lengths of the two segments a triangle's base is divided into by its altitude:

12.22. The base decreased and increased by the difference between the squares of the sides divided by the base; when divided by two they are the true segments. The perpendicular ltitudeis the square-root from the square of a side diminished by the square of its segment.

Thus the lengths of the two segments are .

He further gives a theorem on rational triangles. A triangle with rational sides , , and rational area is of the form:

:$a = \frac\left(\frac+v\right), \ \ b = \frac\left(\frac+w\right), \ \ c = \frac\left(\frac - v + \frac - w\right)$

for some rational numbers , , and .

Brahmagupta's theorem

Brahmagupta continues,

12.23. The square-root of the sum of the two products of the sides and opposite sides of a non-unequal quadrilateral is the diagonal. The square of the diagonal is diminished by the square of half the sum of the base and the top; the square-root is the perpendicular ltitudes

So, in a "non-unequal" cyclic quadrilateral (that is, an isosceles trapezoid), the length of each diagonal is .

He continues to give formulas for the lengths and areas of geometric figures, such as the circumradius of an isosceles trapezoid and a scalene quadrilateral, and the lengths of diagonals in a scalene cyclic quadrilateral. This leads up to Brahmagupta's famous theorem,

12.30–31. Imaging two triangles within cyclic quadrilateralwith unequal sides, the two diagonals are the two bases. Their two segments are separately the upper and lower segments ormedat the intersection of the diagonals. The two ower segmentsof the two diagonals are two sides in a triangle; the base f the quadrilateral is the base of the triangle Its perpendicular is the lower portion of the entralperpendicular; the upper portion of the entralperpendicular is half of the sum of the idesperpendiculars diminished by the lower ortion of the central perpendicular

Pi

In verse 40, he gives values of ,

12.40. The diameter and the square of the radius achmultiplied by 3 are espectivelythe practical circumference and the area f a circle The accurate aluesare the square-roots from the squares of those two multiplied by ten.

So Brahmagupta uses 3 as a "practical" value of , and $\sqrt \approx 3.1622\ldots$ as an "accurate" value of , with an error less than 1%.

Measurements and constructions

In some of the verses before verse 40, Brahmagupta gives constructions of various figures with arbitrary sides. He essentially manipulated right triangles to produce isosceles triangles, scalene triangles, rectangles, isosceles trapezoids, isosceles trapezoids with three equal sides, and a scalene cyclic quadrilateral.

After giving the value of pi, he deals with the geometry of plane figures and solids, such as finding volumes and surface areas (or empty spaces dug out of solids). He finds the volume of rectangular prisms, pyramids, and the frustum of a square pyramid. He further finds the average depth of a series of pits. For the volume of a frustum of a pyramid, he gives the "pragmatic" value as the depth times the square of the mean of the edges of the top and bottom faces, and he gives the "superficial" volume as the depth times their mean area.

Trigonometry

Sine table

In Chapter 2 of his ''Brāhmasphuṭasiddhānta'', entitled ''Planetary True Longitudes'', Brahmagupta presents a sine table:

2.2–5. The sines: The Progenitors, twins; Ursa Major, twins, the Vedas; the gods, fires, six; flavors, dice, the gods; the moon, five, the sky, the moon; the moon, arrows, suns ../blockquote>

Here Brahmagupta uses names of objects to represent the digits of place-value numerals, as was common with numerical data in Sanskrit treatises. Progenitors represents the 14 Progenitors ("Manu") in Indian cosmology or 14, "twins" means 2, "Ursa Major" represents the seven stars of Ursa Major or 7, "Vedas" refers to the 4 Vedas or 4, dice represents the number of sides of the traditional die or 6, and so on. This information can be translated into the list of sines, 214, 427, 638, 846, 1051, 1251, 1446, 1635, 1817, 1991, 2156, 2312, 2459, 2594, 2719, 2832, 2933, 3021, 3096, 3159, 3207, 3242, 3263, and 3270, with the radius being 3270 (this numbers represent $3270\sin \frac$ for $n=1,\dots,24$). Brahmagupta's sine table, like much other numerical data in Sanskrit treatises, is encoded mostly in concrete-number notation that uses names of objects to represent the digits of place-value numerals, starting with the least significant. ..br />There are fourteen Progenitors ("Manu") in Indian cosmology; "twins" of course stands for 2; the seven stars of Ursa Major (the "Sages") for 7, the four Vedas, and the four sides of the traditional dice used in gambling, for 6, and so on. Thus Brahmagupta enumerates his first six sine-values as 214, 427, 638, 846, 1051, 1251. (His remaining eighteen sines are 1446, 1635, 1817, 1991, 2156, 2312, 2459, 2594, 2719, 2832, 2933, 3021, 3096, 3159, 3207, 3242, 3263, 3270). The ''Paitamahasiddhanta'', however, specifies an initial sine-value of 225 (although the rest of its sine-table is lost), implying a trigonometric radius of ''R'' = 3438 approx= C(')/2π: a tradition followed, as we have seen, by Aryabhata. Nobody knows why Brahmagupta chose instead to normalize these values to R = 3270.

Interpolation formula

In 665 Brahmagupta devised and used a special case of the Newton–Stirling interpolation formula of the second-order to interpolate
new values of the sine function from other values already tabulated. The formula gives an estimate for the value of a function at a value of its argument (with and ) when its value is already known at , and .

The formula for the estimate is:

: $f( a + x h ) \approx f(a) + x \frac + x^2 \frac.$

where is the first-order forward-difference operator, i.e.

: $\Delta f(a) \ \stackrel\ f(a+h) - f(a).$

Early concept of Gravity

Brahmagupta in 628 first described gravity as an attractive force, using the term " gurutvākarṣaṇam (गुरुत्वाकर्षणम्)]" to describe it:

The earth on all its sides is the same; all people on the earth stand upright, and all heavy things fall down to the earth by a law of nature, for it is the nature of the earth to attract and to keep things, as it is the nature of water to flow ... If a thing wants to go deeper down than the earth, let it try. The earth is the only ''low'' thing, and seeds always return to it, in whatever direction you may throw them away, and never rise upwards from the earth.

Astronomy

Brahmagupta directed a great deal of criticism towards the work of rival astronomers, and his ''Brāhmasphuṭasiddhānta'' displays one of the earliest schisms among Indian mathematicians. The division was primarily about the application of mathematics to the physical world, rather than about the mathematics itself. In Brahmagupta's case, the disagreements stemmed largely from the choice of astronomical parameters and theories. Critiques of rival theories appear throughout the first ten astronomical chapters and the eleventh chapter is entirely devoted to criticism of these theories, although no criticisms appear in the twelfth and eighteenth chapters.

Some of the important contributions made by Brahmagupta in astronomy are his methods for calculating the position of heavenly bodies over time ( ephemeris, ephemerides), their rising and setting, conjunctions, and the calculation of solar and lunar eclipses.

In chapter seven of his ''Brāhmasphuṭasiddhānta'', entitled ''Lunar Crescent'', Brahmagupta rebuts the idea that the Moon is farther from the Earth than the Sun. He does this by explaining the illumination of the Moon by the Sun.

1. If the moon were above the sun, how would the power of waxing and waning, etc., be produced from calculation of the longitude of the moon? The near half would always be bright.

2. In the same way that the half seen by the sun of a pot standing in sunlight is bright, and the unseen half dark, so is he illuminationof the moon f it isbeneath the sun.

3. The brightness is increased in the direction of the sun. At the end of a bright .e. waxinghalf-month, the near half is bright and the far half dark. Hence, the elevation of the horns f the crescent can be derivedfrom calculation. ..ref>

He explains that since the Moon is closer to the Earth than the Sun, the degree of the illuminated part of the Moon depends on the relative positions of the Sun and the Moon, and this can be computed from the size of the angle between the two bodies. Brahmagupta discusses the illumination of the moon by the sun, rebutting an idea maintained in scriptures: namely, that the moon is farther from the earth than the sun is. In fact, as he explains, because the moon is closer the extent of the illuminated portion of the moon depends on the relative positions of the moon and the sun, and can be computed from the size of the angular separation α between them.

Further work exploring the longitudes of the planets, diurnal rotation, lunar and solar eclipses, risings and settings, the moon's crescent and conjunctions of the planets, are discussed in his treatise Khandakhadyaka.

See also

* Brahmagupta–Fibonacci identity
* Brahmagupta's formula
* Brahmagupta theorem
* Chakravala method
* List of Indian mathematicians
* History of science and technology in the Indian subcontinent

Citations and footnotes

Footnotes

Citations

References

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Further reading

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External links

Brahmagupta's Brahma-sphuta-siddhanta
edited by Ram Swarup Sharma, Indian Institute of Astronomical and Sanskrit Research, 1966. English introduction, Sanskrit text, Sanskrit and Hindi commentaries (PDF)
* , translated by Henry Thomas Colebrooke

{{DEFAULTSORT:Brahmagupta
Brahmagupta,
598 births
7th-century deaths
Scientists from Rajasthan
Rajasthani people
People from Jalore district
7th-century Indian mathematicians
Scholars from Rajasthan