Researchers have said that they have been able to finally solve the cryptic deathbed puzzle, which was apparently seen by Indian mathematician Srinivasa Ramanujan in his dreams.

Ramanujan wrote letters to his mentor, English mathematician G. H. Hardy about several new mathematical functions along with suggestions about how to solve them. His letters described several new functions that were different from theta functions but were closely related.

Researchers have been finally been able to solve the problems from his mysterious letters almost 100 years after he died. Researchers, who were able to solve the problems, said that Ramanujan was right and the problem could be used to explain the behavior of black holes.

Emory University mathematician Ken Ono said, "We've solved the problems from his last mysterious letters. For people who work in this area of math, the problem has been open for 90 years."

The mathematician was born on December 22, 1887 in Erode, Madras Presidency, which is now the state of Tamil Nadu. The Indian government marks his birth anniversary as the National Mathematics Day in the country. Ramanujan was introduced to formal education in Mathematics at the age of 10 and within two years he had finished books on advanced trigonometry and even discovered his own theorems.

He conducted research on Bernoulli numbers and the Euler-Mascheroni constant in young age. After not succeeding in other subjects, he moved to independent mathematical research and sent samples of his work to University of Cambridge. Ramanujan was then invited by GH Hardy to work alongside him at Cambridge.