Srinivasa Ramanujan was born on December 22, 1887, in Erode, India. He showed a remarkable aptitude for mathematics from a young age and began teaching himself advanced mathematical concepts. Despite having limited access to books and formal education, Ramanujan went on to make substantial contributions to mathematical analysis, number theory, and continued fractions.

In 1913, Ramanujan wrote a letter to the British mathematician G. H. Hardy, in which he outlined some of his mathematical discoveries. Impressed by Ramanujan’s talent, Hardy arranged for him to come to England to continue his work. In England, Ramanujan worked closely with Hardy and other mathematicians and published numerous papers that were highly regarded by the mathematical community.

Ramanujan suffered from health problems throughout his life and was diagnosed with tuberculosis, which worsened during his time in England. He returned to India in 1919 and died on April 26, 1920, at the young age of 32.

## Mathematical Methods

Srinivasa Ramanujan made significant contributions to several areas of mathematics, including mathematical analysis, number theory, and continued fractions. Some of the key mathematical methods and concepts that he is known for are:

- Infinite series: Ramanujan discovered many new results related to infinite series and developed several new techniques for evaluating them.
- Modular forms: He made important contributions to the theory of modular forms, which are mathematical objects that arise in the study of elliptic curves and the theory of modular forms.
- Partitions: Ramanujan discovered new results related to the partition function, which counts the number of ways a positive integer can be written as a sum of positive integers.
- Tau functions: He introduced the concept of tau functions, which are mathematical functions that play a key role in the study of modular forms.
- Continued fractions: Ramanujan made significant contributions to the study of continued fractions, which are mathematical objects that can be used to approximate real numbers.

## Contributions to Mathematics

Srinivasa Ramanujan made several important contributions to the field of mathematics, which have had a lasting impact on several areas of the subject. Some of his key contributions are:

- Number theory: Ramanujan made substantial contributions to number theory, including the discovery of new results related to prime numbers and the distribution of primes. He also introduced several new functions and identities related to prime numbers and partitions of numbers.
- Modular forms: He made important contributions to the theory of modular forms and elliptic functions, including the discovery of new results and identities related to these subjects.
- Infinite series: Ramanujan discovered several new results related to infinite series, including new techniques for evaluating such series and the discovery of new identities and formulas.
- Continued fractions: He made significant contributions to the study of continued fractions and discovered new results and techniques related to these mathematical objects.
- Combinatorics: Ramanujan made important contributions to the field of combinatorics, including the discovery of new results related to partitions of numbers and the study of special functions.

## Ramanujanâ€™s Influence on Modern Mathematics

Srinivasa Ramanujan’s influence on modern mathematics is substantial and widespread. His work continues to be highly regarded by mathematicians and has had a lasting impact on several areas of the subject. Some of the ways in which Ramanujan’s work has influenced modern mathematics are:

- Number theory: Ramanujan’s contributions to number theory, including his work on prime numbers, partitions, and special functions, have had a lasting impact on the subject and continue to be studied and applied today.
- Modular forms: Ramanujan’s work on modular forms and elliptic functions has been highly influential in the development of modern number theory and has applications in several areas of mathematics and physics.
- Infinite series: Ramanujan’s contributions to infinite series and the evaluation of such series has had a lasting impact on the subject and continue to be studied and applied today.
- Continued fractions: Ramanujan’s work on continued fractions continues to be highly regarded and has had a lasting impact on the subject.
- Combinatorics: Ramanujan’s contributions to combinatorics and the study of partitions have had a lasting impact on the subject and continue to be studied and applied today.

## Number Theory

Number theory is a branch of mathematics that deals with the study of integers, including prime numbers, divisibility, and Diophantine equations. Some of the key concepts and results in number theory are:

- Prime numbers: Prime numbers are integers that are only divisible by 1 and themselves. The study of prime numbers is a central theme in number theory, and many important results and conjectures related to prime numbers have been discovered in this field.
- Divisibility: Number theory deals with the study of divisibility and the relationships between integers, including the Euclidean algorithm, which is used to find the greatest common divisor of two integers.
- Diophantine equations: Diophantine equations are mathematical equations that look for integer solutions. The study of Diophantine equations is an important part of number theory, and many important results and techniques have been discovered in this field.
- Modular forms: Modular forms are mathematical objects that arise in the study of elliptic curves and the theory of modular forms. They play an important role in number theory and have applications in several areas of mathematics and physics.
- Cryptography: Number theory plays an important role in cryptography and the study of secure communication. The use of prime numbers and other number theoretical concepts is a key part of many modern encryption algorithms.

## Ramanujan and His Letter to G.H. Hardy

Srinivasa Ramanujan’s letter to G.H. Hardy is a famous document in the history of mathematics. It was a letter sent by Ramanujan to Hardy in 1913, in which Ramanujan outlined some of his most important mathematical discoveries and results.

The letter was the first time that Hardy had heard of Ramanujan, and he was impressed by the mathematical prowess demonstrated by the young Indian mathematician. Hardy arranged for Ramanujan to come to England and work with him at the University of Cambridge, where Ramanujan made several important contributions to the field of mathematics.

Ramanujan’s letter to Hardy is now considered a classic document in the history of mathematics and is widely regarded as one of the most important pieces of correspondence in the field. The letter demonstrates Ramanujan’s exceptional mathematical abilities and is a testament to his remarkable achievements in the field of mathematics.

## Ramanujan’s Unsung Contributions to Mathematics

Srinivasa Ramanujan is widely recognized for his contributions to mathematics, but there are still some of his results and discoveries that are less well-known. Some of his unsung contributions to mathematics are:

- Hypergeometric series: Ramanujan made important contributions to the theory of hypergeometric series, which are infinite series that can be used to describe a wide range of mathematical functions.
- Elliptic functions: Ramanujan made significant contributions to the theory of elliptic functions, including the discovery of new results and identities related to these functions.
- Special functions: Ramanujan introduced several new special functions, including the Ramanujan tau function, which has important applications in the study of modular forms and elliptic curves.
- Partitions: Ramanujan made important contributions to the study of partitions of numbers and the theory of generating functions, which can be used to describe the distribution of numbers.
- Analytic theory of numbers: Ramanujan made significant contributions to the analytic theory of numbers, including the discovery of new results and techniques related to the distribution of prime numbers.

## Ramanujan and His Work with the divergent series

Srinivasa Ramanujan made important contributions to the study of divergent series, which are infinite series that do not converge to a finite sum.

Divergent series are typically seen as problematic in mathematics, as they do not have a well-defined sum. However, Ramanujan was able to find new ways of handling these series and discovered several new results related to them.

One of Ramanujan’s most famous contributions to the study of divergent series is his discovery of the idea of “summability by parts,” which allows for the sum of divergent series to be approximated in certain cases. This idea was later developed into the field of analytic number theory and has had a lasting impact on the subject.

Another important contribution made by Ramanujan to the study of divergent series is his discovery of the Ramanujan summation method, which is a technique for summing divergent series using the properties of the Riemann zeta function.

## Impacts on Modern Number Theory

Srinivasa Ramanujan’s contributions to mathematics, including his work in number theory, have had a lasting impact on the field and continue to be widely studied and applied today. Some of the impacts of Ramanujan’s work on modern number theory include:

- Modular Forms: Ramanujan’s work on modular forms was ahead of its time and has since become a central theme in modern number theory. The concept of modular forms has been applied to a wide range of mathematical and scientific problems and continues to be actively researched.
- Partition theory: Ramanujan’s contributions to the study of partitions of numbers and the theory of generating functions have had a lasting impact on the field and continue to be an important area of research.
- Analytic theory of numbers: Ramanujan’s work on the analytic theory of numbers and the distribution of prime numbers has influenced the development of modern number theory and has applications in cryptography and other areas.
- Summation of series: Ramanujan’s contributions to the study of divergent series and his discovery of new methods for summing these series have had a lasting impact on the field of number theory and continue to be studied and applied.