It is marked to recognise and celebrate the works of Srinivasa Ramanujan.
He was born on this day in 1887 in Tamil Nadu’s Erode.
The day was announced by the then Prime Minister Manmohan Singh to mark the 125th anniversary of the birth of this mathematical genius in 2012.
2012 was also observed as National Mathematics Year.
He had developed a liking for mathematics at a very young age, mastering trigonometry at 12.
Ramanujan was elected to the London Mathematical Society in 1917.
Next year, he was elected to the prestigious Royal Society for his research on Elliptic Functions and theory of numbers.
He was also the first Indian to be elected a Fellow of the Trinity College.
His areas of work include infinite series, continued fractions, number theory and mathematical analysis, despite not receiving any formal training in pure maths.
He also made notable contributions like the hypergeometric series, the Riemann series, the elliptic integrals, the theory of divergent series, and the functional equations of the zeta function.
His biography ‘The Man Who Knew Infinity’ by Robert Kanigel depicts his life and journey to fame.
1729 is called Ramanujan number.
It is the smallest number expressible as the sum of two cubes in two different ways.
Because of this incident, 1729 is now known as the Ramanujan-Hardy number.