Monday 14 July 2014

INDIAN MATHEMATICS

Some Indians feel that Indian mathematicians discovered all the mathematical concepts and the Europeans simply took them from India. On the contrary, some European scholars brush aside Indian mathematics and give the credit to Greece. Neither of these views is fully correct.   

After seeing the works of all the Indian mathematicians down the ages, one can be absolutely certain that India had great mathematicians who were original, and had produced concepts that were discovered in the western world much later. 

It is very difficult to say with certainty if the west has learnt and borrowed anything from India in the development of western mathematics except for the numerals, zero and the concept of infinity. But since contact between the cultures of India and the West started with the Bactrian Greeks, it is likely that through them, the Indian thought on Mathematics was transmitted to the west. it is highly probable that much later through the Arab Caliphates of Cordoba Grenada, different ideas have been exchanged and thoughts would have flown both ways. Europeans have also borrowed concepts from Mesopotamia who in turn may have been influenced by Indian thought and also influenced it. 

But while the Europeans went ahead and developed mathematics further, the Indian mathematics stagnated after the 16th century till Srinivasa Ramanujan came along. 

It is universally acknowledged today that the concept of Zero, Infinity, the decimal system world uses today as well as the so called Arabic numerals are of Indian origin. The Indian numerals hvae gone to Europe through the Arab caliphates in Spain and thus are known as Arabic numerals. 

I have gone through Wikipedia for learning more on Indian mathematics and abridged its content below mathematician wise.

Baudhayana (8thCentury BC): He composed the Sulabha Sutras( these are the mathematics required for construction of the sacrificial altars of the Vedas).

Baudhayana’s treatise contains a general statement of the Pythagorean Theorem for the sides of a square and also simple Pythagorean triples.  He also gave a square root for the number 2 which is accurate up to 5 decimal places. It should be noted that Baudhayana predates Pythagoras who lived in the 6th century BC.

There were two other Sulabha Sutras composed by Manava (7thcentury BC) and Apastamba (6th century BC).

Pingala(3rd Century BC): He is a musical theorist who authored a Sanskrit treatise on prosody. He stumbled upon the Pascal Triangle and the binomial coefficients despite not having knowledge of the binomial theorem itself. His work also contains the basic idea of Fibonacci numbers. Although his entire work did not survive, a 10th century AD commentary on it by Halayudha exists.    

Katyayana(3rd Century BC): He wrote Katyayana Sulabha Sutra which presented a lot of geometry including the general Pythagorean Theorem and also a computation of the square root of 2 to 5 decimal places.  

Jain Mathematicians(400 BC to 200 AD): The Jaina mathematicians freed the Indian mathematics from its religious and ritualistic contents. They concentrated a lot on the concept of infinity.  

They devised notations for simple powers (and exponents) of numbers like squares and cubes, which enabled them to define simple algebraic equations. Jaina mathematicians were apparently also the first to use the word Shunya (void in Sanskrit) to refer to zero. 

Surya Siddhanta (400AD): The author of this treatise is unknown.It contains the roots of modern trigonometry. It uses Sine, Cosine, Tangent and the inverse Sine.

Aryabhata I (476-550AD): he wrote the Aryabhatiya which contained Quadratic equations, Trigonometry and the value of Pi up to 4 decimal places.  

Varahamihira (505-587AD): He wrote the Pancha Sidhhanta which made contributions to Trigonometry including Sine and Cosine tables up to 4 decimal places and some formulas relating to them.    

Brahmagupta (597-668 AD): In his astronomical work Brahma Sphuṭa Siddhanta , included two chapters devoted to the field of mathematics. Basic operations (including cube roots, fractions, ratio and proportion, and barter)and Practical mathematics (including mixture, mathematical series, plane figures, stacking bricks, sawing of timber, and piling of grain). 

Brahmagupta was the first to give rules to compute with zero.

Brahmagupta gave the solution of the general linear equations.

He also went on to solve systems of simultaneous indeterminate equations.

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

Bhaskara I  (600–680 AD): He expanded the work of Aryabhata in his books titled Mahabhaskariya, Aryabhatiya-bhashya and Laghu-bhaskariya.

Hecame out with:

Solutions of indeterminate equations.

An approximation of the Sine function.

A formula for calculating the Sine of an acute angle without the use of a table,correct to 2 decimal places.

AryabhataII  (c. 920–1000) wrote a commentary on Shridhara, and an astronomical treatise Maha-Siddhanta. The latter discusses Arithmetic, Algebra and solutions of indeterminate equations.

Shripati Mishra (1019-1066) wrote on permutations and combinations,solution of simultaneous indeterminate linear equation, calculating of planetary longitudes, eclipses and planetary transits.   

Bhaskara II (1114-1185) wrote a number of important treatises.Siddhanta Shiromani, Lilavati Ganita, Bija Ganita, Gola Adhyaya and is one of India’s greatest mathematicians. He has contributed on

 1.    Interest computation.

2.    Arithmetic and Geometric progressions.

3.    Plane Geometry.

4.    Solid Geometry.

5.    Solutions of combinations.

6.    Proof for being divided by zero is infinity.

7.    Proof of the Pythagorean Theorem.

8.    Surds.

9.   Solutions of Quadratic equations, Cubic equations, Quartic equations, equations with more than one unknown.

10.  Conceived differential calculus.

11.  Compute Pi to 5 decimal places.

12.  Calculated the length of the earth’s revolution around the sun.   

The Kerala school of astronomy and mathematics (1300-1600 AD) was founded by Madhava of Sangamagrama in Kerala, South India and included among its members:

1. Parameshvara,

2.Neelakanta Somayaji,

3.Jyeshtadeva,

4.Achyuta Pisharati,

5.Melpathur Narayana Bhattathiri,

6.Achyuta Panikkar.

In attempting to solve astronomical problems, the Kerala school astronomers independently created a number of important mathematical concepts. The most important result being the series expansion for trigonometric functions.

The theorems were stated without proof, but proofs for the series for sine, cosine,and inverse tangent were provided a century later in the work written in Malayalam, by Jyesthadeva.

Their discovery of these three important series expansions of calculus, several centuries before calculus was developed in Europe by Isaac Newton and  Leibniz was an achievement.However, the Kerala School did not invent calculus; they developed neither a theory of differentiation or integration, nor the fundamental theorem of calculus.


Varahamihira (505-587AD): He wrote the Pancha Sidhhanta which made contributions to Trigonometry including Sine and Cosine tables up to 4 decimal places and some formulas relating to them.    

Brahmagupta (597-668 AD): In his astronomical work Brahma Sphuṭa Siddhanta , included two chapters devoted to the field of mathematics. Basic operations (including cube roots, fractions, ratio and proportion, and barter)and Practical mathematics (including mixture, mathematical series, plane figures, stacking bricks, sawing of timber, and piling of grain). 

Brahmagupta was the first to give rules to compute with zero.

Brahmagupta gave the solution of the general linear equations.

He also went on to solve systems of simultaneous indeterminate equations.

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

Bhaskara I  (600–680 AD): He expanded the work of Aryabhata in his books titled Mahabhaskariya, Aryabhatiya-bhashya and Laghu-bhaskariya.

Hecame out with:

Solutions of indeterminate equations.
An approximation of the Sine function.
A formula for calculating the Sine of an acute angle without the use of a table,correct to 2 decimal places.

AryabhataII  (c. 920–1000) wrote a commentary on Shridhara, and an astronomical treatise Maha-Siddhanta. The latter discusses Arithmetic, Algebra and solutions of indeterminate equations.

Shripati Mishra (1019-1066) wrote on permutations and combinations,solution of simultaneous indeterminate linear equation, calculating of planetary longitudes, eclipses and planetary transits.   

Bhaskara II (1114-1185) wrote a number of important treatises.Siddhanta Shiromani, Lilavati Ganita, Bija Ganita, Gola Adhyaya and is one of India’s greatest mathematicians. He has contributed on

1.    Interest computation.
2.    Arithmetic and Geometric progressions.
3.    Plane Geometry.
4.    Solid Geometry.
5.    Solutions of combinations.
6.    Proof for being divided by zero is infinity.
7.    Proof of the Pythagorean Theorem.
8.    Surds.
9.   Solutions of Quadratic equations, Cubic equations, Quartic equations, equations with more than one unknown.
10.  Conceived differential calculus.
11.  Compute Pi to 5 decimal places.
12.  Calculated the length of the earth’s revolution around the sun.   

The Kerala school of astronomy and mathematics (1300-1600 AD) was founded by Madhava of Sangamagrama in Kerala, South India and included among its members:

1. Parameshvara,
2.Neelakanta Somayaji,
3.Jyeshtadeva,
4.Achyuta Pisharati,
5.Melpathur Narayana Bhattathiri,
6.Achyuta Panikkar.

In attempting to solve astronomical problems, the Kerala school astronomers independently created a number of important mathematical concepts. The most important result being the series expansion for trigonometric functions.

The theorems were stated without proof, but proofs for the series for sine, cosine,and inverse tangent were provided a century later in the work written in Malayalam, by Jyesthadeva.

Their discovery of these three important series expansions of calculus, several centuries before calculus was developed in Europe by Isaac Newton and  Leibniz was an achievement.However, the Kerala School did not invent calculus; they developed neither a theory of differentiation or integration, nor the fundamental theorem of calculus.

Monday 7 July 2014

SANKARACHARYA AND ADVAITA.

As per many of the scholars Sankaracharya lived between 788 and 820 AD for a period of just 32 years. His biography isinterlaced with legend and lore and cannot be historically supported. Whatevermay have been the events of his life, he has championed the cause of Advaita and hisbrilliance has few equals amongst the Indian philosophers.  

Sankara was born at Kaladi in Kerala.According to tradition and lore, his parents had been childless for many yearsand prayed in a Shiva temple at Thrissur for a child.

Shiva later appeared to both the husband and wife in their dreams and asked them to choose between a mediocre son with along life and an extraordinary son who would live for a short time. They chose the latter and when the son was born to them whom they named him Sankara.

His father died when Sankara was very young and his Upanayanam was performed by his mother. As a child Sankara showed remarkable scholarship by mastering the 4 Vedas by the age of 8.   

Sankara was attracted towards sanyasa at theage of 8 itself but his mother gave her consent for that only after much persuasion. Legend says that once when he was bathing in the Poorna river, acrocodile caught hold of his leg and it appeared that it would kill him.Sankara then requested his mother to give him consent for sanyasa at least before his death. His mother consented and the crocodile left Sankara and disappeared.

Sankara, then traveled to North India in search of a Guru. On the banks of river Narmada at Omkareswar (MP) he met Govinda Bhagavatpada. When the latter questioned about Sankara’s identity,Sankara came out with a wonderful verse that brought out the Advaita philosophy. Govinda was impressed by Sankara and accepted as his disciple.        

Theguru instructed Sankara to write a commentary on the Brahma Sutras and propagate theAdvaita philosophy. Sankara travelled to Kashi,where a young man named Sanandana,hailing from Chola territory in South India,became his first disciple.

Accordingto legend, while on his way to the Vishwanath Temple atKasi, an untouchable accompanied by fourdogs came in the way of Sankara. When asked to move aside by Sankara'sdisciples, the untouchable replied: "Do you wish that I move my everlasting Ātman or this body made of flesh?"

Realizingthat the untouchable was none other than god Shiva himself, and his dogs the four Vedas,Sankara prostrated himself before him, composing five shlokas.

At Badari he wrote his famous Bhashyas (commentaries).

Oneof the most famous debates of Sankara was with Maṇḍana Miśra. Sankara sought a debate with Kumārila Bhaṭṭa and met him in Prayag where he had buried himself in a slow burning pyre to repent for sins committed against his guru. Kumārila Bhaṭṭa then asked Sankara to proceed to Mahiṣhmati tomeet Maṇḍana Miśra and debate with him instead.

Maṇḍana Miśra held the view that the life of a householder was far superior to that of a monk. This view was widely shared and respected throughout India at that time.

This is totally against what Sankara believed and therefore it is important for Sankara to debate with Mandana.

After debating for over fifteen days, with Maṇḍana Misra'swife Ubhaya Bhāratī acting as referee, Maṇḍana Misra accepted defeat.

Ubhaya Bhāratī then challenged Sankara to have a debate with her in order to'complete' the victory. She asked him questions related to sexual union between man and woman – a subject in which Sankara had no knowledge, since he was a true celibate and sanyasi.

Sankara asked for a "recess" of 15 days. As per legend, he used the art of "para-kaya pravesa" (the spirit leavingone's own body and entering another's) and exited his own body, which he asked his disciples to look after, and psychically entered the dead body of a king and learnt the art of love from the Kings 2 wives. Later, Sankara entered his own body and regained consciousness and he answered all questions put to him by Ubhaya Bhāratī and defeated her.

After this, Sankara began a tour of conquest for thepropagation of the Advaita philosophy by controverting all philosophies opposedto it. He travelled throughout India, from South India to Kashmir and Nepal, preaching to the local populace and debating philosophy with Hindu, Buddhist and other scholars and monks along the way.

This was no mean feat as in those times India is heavily forested and the roads and forests are fully infested with robbers and bandits.Despite this Sankara traveled fearlessly to the 4 corners of India and founded the 4 peethams at Sringeri, Dwaraka, Badrinath and Puri.

He died at the age of 32, a young age but by that time itself, his brilliance has established him as a great philosopher.

Now, what is thephilosophy of Sankara? I try to put it very briefly below.

Ultimate reality according to Sankara is Atman or Brahman which is pure consciousness devoid of all attributes (nirguna) and all categories of the intellect (nirvisesha).

Brahman associated with its potency Maya appears as the qualified Brahman or the lord who is the creator, preserver and destroyer of this world which is his appearance.

Jiva or the individual self is a subject object complex.

Its subject element is pure consciousness and is called Sakhsin.


Its object element is the internal organ called Antahkarana. The source of this internal organ is Avidya which causes individuality.


In liberation Avidya is destroyed by Jnana and Sakshi is realized as the Brahman which it always is.

Maya or Avidya is not pure illusion. It is not only absence of knowledge but also positive wrong knowledge. It is a cross of the real and the unreal. In fact, it is indescribable. It is neither existent, nor nonexistence nor both.

Sankara emphasizes that from the phenomenal point of view,the world is quite real. It is not an illusion. It is the creation of Ishwara. Jiva is ignorant of the essential unity and takes only diversity as true and wrongly regards himself as the agent and the enjoyer. Avidya conceals the unity and projects names and forms. When Jiva realizes this Avidya, Moksha is attained and the final release is attained after death.