Saturday, December 15, 2012

Indian Mathematicians And Their Contributions

Ramanujan Ramanujan Indian Mathematicians And Their Contributions

    He was born on 22nd of December 1887 in a small village of Tanjore district, Madras. He failed in English in Intermediate, so his formal studies were stopped but his self-study of mathematics continued. He sent a set of 120 theorems to Professor Hardy of Cambridge. As a result he invited Ramanujan to England.
    Ramanujan showed that any big number can be written as sum of not more than four prime numbers.
    He showed that how to divide the number into two or more squares or cubes.
    When Mr Litlewood came to see Ramanujan in taxi number 1729, Ramanujan said that 1729 is the smallest number which can be written in the form of sum of cubes of two numbers in two ways, i.e. 1729 = 93 + 103 = 13 + 123 since then the number 1729 is called Ramanujan’s number.
    In the third century B.C, Archimedes noted that the ratio of circumference of a circle to its diameter is constant. The ratio is now called ‘pi ( Π )’ (the 16th letter in the Greek alphabet series)
    The largest numbers the Greeks and the Romans used were 106 whereas Hindus used numbers as big as 1053 with specific names as early as 5000 B.C. during the Vedic period.

ARYABHATAaryabhatta Indian Mathematicians And Their Contributions

    Aryabhatta was born in 476A.D in Kusumpur, India.
    He was the first person to say that Earth is spherical and it
revolves around the sun.
    He gave the formula (a + b)2 = a2 + b2 + 2ab

    He taught the method of solving the following problems:

BRAHMAGUPTAbrahmagupta Indian Mathematicians And Their Contributions

    Brahma Gupta was born in 598A.D in Pakistan.
    He gave four methods of multiplication.

    He gave the following formula, used in G.P series

a + ar + ar2 + ar3 +……….. + arn-1 = (arn-1) ÷ (r – 1)

    He gave the following formulae :

Area of a cyclic quadrilateral with side a, b, c, d= √(s -a)(s- b)(s
-c)(s- d) where 2s = a + b + c + d
 Length of its diagonals = bio1 2 Indian Mathematicians And Their Contributions

SHAKUNTALA DEVIShakuntalaDevi 2336 Indian Mathematicians And Their Contributions

ShakuntalaDevi was born in 1939.    In 1980, she gave the product of two, thirteen digit numbers within 28 seconds, many countries have invited her to demonstrate her extraordinary talent.
    In Dallas she competed with a computer to see who give the cube root  of 188138517 faster, she won. At university of USA she was asked to give the 23rd root of


She answered in 50 seconds. The answer is 546372891. It took a UNIVAC 1108 computer, full one minute (10 seconds more) to confirm that she was  right after it was fed with 13000 instructions.
Now she is known to be Human Computer.

BHASKARACHARYAbhaskaracharya Indian Mathematicians And Their Contributions

   He was born in a village of Mysore district.    He was the first to give that any number divided by 0 gives infinity (00).
    He has written a lot about zero, surds, permutation and combination.
    He wrote, “The hundredth part of the circumference of a circle seems  to be straight. Our earth is a big sphere and that’s why it appears to be flat.”
    He gave the formulae like sin(A ± B) = sinA.cosB ± cosA.sinB


Friday, December 14, 2012

அல்ஜீப்ரா என்ற பெயர் எப்படி வந்தது?

 அல்ஜீப்ரா என்ற சொல் "அல் - ஜபர்" (al-jabr) என்ற  அராபிய மொழி மருத்துவ குறிச்சொல்லில் இருந்து வந்தது. "அல் - ஜபர் " என்ற சொல்லுக்கு உடைந்த பாகங்களை மீண்டும் சேர்த்தல் என்பது பொருள் ஆகும்.

Algebra was invented by the Muslim mathematician Al-Khwarizmi in the book he wrote in 
820 AD. Algebra is the Arabic word (aljabr) for "equation", and the word "algorithm" comes from the author's name, Al-Khwarizmi. He is rightly known as "the father of Algebra".