For more than three thousand years, mathematics has played an important role in Indian culture. Sometimes it was studied for practical reasons and sometimes for pure intellectual delight. The earliest traces of mathematics are found in the Indus Valley, around 3000 BC. There is clear evidence of a structured system of weights and measures and samples of decimal-based numeration [TM239 or search for “thatsmaths” at irishtimes.com].

## Posts Tagged 'Ramanujan'

### The Rich Legacy of Indian Mathematics

Published November 17, 2022 Irish Times ClosedTags: History, Ramanujan

### Discoveries by Amateurs and Distractions by Cranks

Published January 17, 2019 Irish Times ClosedTags: History, Ramanujan, Recreational Maths

Do amateurs ever solve outstanding mathematical problems? Professional mathematicians are aware that almost every new idea they have about a mathematical problem has already occurred to others. Any really new idea must have some feature that explains why no one has thought of it before [TM155 or search for “thatsmaths” at irishtimes.com].

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### Ramanujan’s Astonishing Knowledge of 1729

Published May 12, 2016 Occasional ClosedTags: Number Theory, Ramanujan

**Question:** What is the connection between Ramanujan’s number 1729 and Fermat’s Last Theorem? For the answer, read on.

The story of how Srinivasa Ramanujan responded to G. H. Hardy’s comment on the number of a taxi is familiar to all mathematicians. With the recent appearance of the film *The Man who Knew Infinity*, this curious incident is now more widely known.

Visiting Ramanujan in hospital, Hardy remarked that the number of the taxi he had taken was 1729, which he thought to be rather dull. Ramanujan replied “No, it is a very interesting number; it is the smallest number expressible as the sum of two cubes in two different ways.”

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### Waring’s Problem & Lagrange’s Four-Square Theorem

Published October 23, 2014 Occasional ClosedTags: Gauss, Number Theory, Primes, Ramanujan

**Introduction**

We are all familiar with the problem of splitting numbers into products of primes. This process is called *factorisation*. The problem of expressing numbers as *sums* of smaller numbers has also been studied in great depth. We call such a decomposition a partition. The Indian mathematician Ramanujan proved numerous ingenious and beautiful results in partition theory.

More generally, **additive number theory** is concerned with the properties and behaviour of integers under addition. In particular, it considers the expression of numbers as sums of components of a particular form, such as powers. Waring’s Problem comes under this heading.

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### Ramanujan’s Lost Notebook

Published December 6, 2012 Irish Times ClosedTags: Number Theory, Ramanujan

In the *Irish Times* column this week ( TM010 ), we tell how a collection of papers of Srinivasa Ramanujan turned up in the Wren Library in Cambridge and set the mathematical world ablaze. Continue reading ‘Ramanujan’s Lost Notebook’