et International Journal on Emerging Technologies (Special Issue NCETST-2017) 8(1): 764-767(2017) (Published by Research Trend, Website: www.researchtrend.net ) ISSN No. (Print) : 0975-8364 ISSN No. (Online) : 2249-3255 ARYABHATA-I: An early Indian Mathematician and his work Govind Singh Assistant Professor-Amrapali Institute of Technology & Sciences, Haldwani (UK) INDIA ABSTRACT: The knowledge of History of early Indian Mathematics prior to 499 CE is not perfect and sufficient. In this paper we explore work done on mathematics by Arya Bhata-I and summarized in his book Arya Bhateeya. Key Words: Arya Bhata-I, Arya Bhateeya, summarized. These two parts are named as Dasageetika and I. INTRODUCTION Ary āshtashatam respectively. On the other hand Arya Kusuma Pura was the older name of Pataliputra Bhata himself gave only a single name to his complete situated in the Magadha state of ancient time, now a work, which was Arya Bhateeya . The second part i.e., place near the modern Patna in Bihar. Aryabhata-I was Ary āshtashatam again ramified as Ganita or one of the Mathematicians and Astronomers those mathematics, Kāla Kriya or the calculation of time and belonged to the Kusuma Pura School of learning, but it the Gōla or sphere. The last two parts deal with the is believed that he was a native of Kerala, a region of astronomical calculations and the first part, which south India. It is due the facts that, the calendar based consists of thirty three verses of the purely upon the systems given in the astronomical work of mathematical importance. Probably Aryabhata-I was Aryabhata-I have been followed to some extent in the first Indian astronomer who gave the value of Kerala even in the modern time. He mentioned in his obliquity as 24 0, however, explicitly in his astronomical work that he was twenty-three year old when the work [12 p. 107 and references therein]. The concept of Kaliyuga’s 3600 th year was progressing. This implies the place value system of numbers was, possibly, first that he was born in the year 476 CE and his work had introduced by Aryabhata-I in his work Arya Bhateeya been completed in 499 CE. Not much about his life is [13 p. 131 and references therein]. The mathematical known. He summarized his work in the book entitled contents dealt with mainly, the methods for extracting Arya Bhateeya however, it is a very small book. It is square roots and cube roots, some problems, the series, believed that the important work Arya Bhateeya had problems on geometry problems related to the quadratic been lost, fortunately, in 1864 an Indian scholar whose equations and the solution of the indeterminate name is Bhau Daji recovered a copy of this work [1 p. equations of the first degree. 40-41 and references therein].The Arya Bhateeya is Aryabhata-I was the first Indian mathematician who considered as the landmark work in history of described the method of solution of the indeterminate mathematical sciences of early India. Various equations. The problem of indeterminate equation was commentator like aroused in the following form. It is required to Bhaskara-I, Somesvera, Parmeswera, Nilkantha determine an integer ‘N’ which when divided ‘m’ Somayaji etc., wrote their valuable commentaries for leaves a remainder r 1, and when divided by ‘n’ leaves the clear understanding of mathematical terms in this the remainder r 2. work. Aryabhata’s one other work known as Therefore, N = mx + r 1 = ny + r 2 Aryabhata-siddhanta, which had been lost, but appeared Or, ny – mx = p through the references found in other works of Where, p = r 1 – r2 mathematical or astronomical interest written after the The equation mx + p = ny time of Aryabhata-I [10 p. 1 and references therein]. Where m, n, p are integers, positive or negative, then The small work, Arya Bhateeya, was divided into two the equation mx + p = ny is known as indeterminate parts by Brahmagupta in his own work Brahma Sphuta equation of the first degree. Clearly, the common factor Siddanta. The first part consists of ten verses from the of m and n should be also a factor common to p, introductory and concluding portions, while the second otherwise the equation is inconsistent. However, the part, which is the larger one, consists of one hundred latter Indian mathematicians called the method of eight verses. solution of indeterminate equation as kuttaka . Singh 764 Aryabhata was undoubtedly, a real mathematician who [11] about this important contribution of Aryabhata, discovered the method of solution of indeterminate that: equation of first degree. Probably, this is the most “Aryabhata-I’s value of π is a very close approximation excellent achievement of Aryabhata-I in the area of to the modern value and the most accurate among those pure mathematics [1 p. 95-96 and references therein]. of the ancients. There are reasons to believe that Some important identities, which were appeared first Aryabhata devised a particular method for finding this time in the Aryabhata’s work, are as the following [1 p. value. It is shown with sufficient grounds that 45 and references therein]: Aryabhata himself used it, and several later Indian ∑ n 2 = 1 2 + 2 2 + 3 2 + 4 2 + ……. + n 2 = [n(n+1)(2n+1)]/6 mathematicians and even the Arabs adopted it. The ∑ n 3 = 1 3 + 2 3 + 3 3 + 4 3 + ………. + n 3 = conjecture that Aryabhat’s value of π is of Greek origin (1+2+3+…..+n) 2 = [n 2(n+1) 2]/4 is critically examined and is found to be without 1+(1+2)+(1+2+3)+(1+2+3+4)+……. Up to n terms = foundation. Aryabhata discovered this value [n(n+1)(n+2)]/6 independently and also realised that π is an irrational Arya Bhateeya described rules of two important number. He had the Indian background, no doubt, but operations, known as Sa ṃkrama ṃa, i.e., the operation excelled all his predecessors in evaluating π. Thus the to find two unknown quantities when their sum and credit of discovering this exact value of π may be difference are given and these rules are as following: ascribed to the celebrated mathematician, Aryabhata-I.” “One should subtract the sum of the squares from the Thus Aryabhata was not only approximated a more square of the sum”. Implies that which is halved should accurate value of π but he was also aware of its be known as the product of two multipliers. In modern irrationality. However, a formal proof of the notations irrationality of π was given by a European [(m+n) 2-(m 2+n 2)]/2 = mn. mathematician only in 1761, whose name is Lambert [1 “The square root of the product multiplied by p. 153 and references therein]. four added to the square of the difference is increased The square root extracting method described in the or decreased by the difference, and halved”. In modern Aryabhata’s work was also found in the earlier Jainas notations canonical works in which, the square root of large [√{4mn+(m-n) 2}+(m-n)]/2 = m; [ √{4mn+(m- numbers for their cosmology was calculated. However, n) 2}-(m-n)]/2 = n. the method of root extraction was not mentioned clearly Bhaskara-I in his commentary on Arya Bhateeya of but it was explained clearly by Aryabhata in his Aryabhata-I entitled as, Aryabhatiya Bhashya, mathematical work. described the first of these as an alternative method to The cube root extraction method found in Aryabhata’s find the product of two quantities [15 p. 58 and work have not been appeared in the earlier references therein]. mathematical work so, most likely it was his original Aryabhata-I constructed a table of sines, to find the work. Algorithm for finding square root was also found approximate values by using a formula for {sin (n+1) θ in the works prior to Aryabhata’s work but, algorithm – sin n θ}, which is in terms of sin n θ and sin (n-1) θ [4 for cube root was first clearly enunciated by him in his p. 47 and references therein]. However, this sine table work Arya Bhateeya [14 p. 161 and references therein]. was included only the angles of multiples of (15/4) 0 and Aryabhata described his rule of cube extraction in the between 0 0 and 90 0 but, this is an important following verse: mathematical development in early India. aghanad bhajed dvit īī yat The approximation of π correct up to five significant trigu ṃena ghansya mulavarge ṃa | figures was first given by Aryabhata-I for to calculate vargastripurvaguita ṃṃ the circumference of a circle of diameter twenty śodhya ṃ prathamad ghana śca thousand units in the following verse: hganat ||5 ( Aryabhateeya, Ganitpada, verse 5) caturadhikam satamastagunam That is, “(Having subtracted the greatest possible cube dvasastistathasaharanam ayuta dvaya from the last cube place and then having written down viskambhasyasanno vrttav parinahah the cube root of the number subtracted in the line of the cube root), divide the second non cube place (standing That is, “add four to 100, multiply by eight, and then on the right of the last cube place) by thrice the square add 62,000. By this rule circumference of a circle with of the cube root (already obtained); (then) subtract from a diameter of 20,000 can be approached.” This gives the first non-cube place (standing on the right of the the ratio of the circumference to the diameter equal to second non-cube place) the square of the quotient {[(4+100)×8+62000]/20000} = 62832/20000 = 3.1416 multiplied by thrice the previous (cube root); and (then which is very close to the modern value of π = 3.14159 subtract) the cube (of the quotient) from the cube place correct up to five places.