Radhanath Sikdar (1813–1870) was an Indian mathematician who among many other things calculated the height of Peak XV in the Himalaya and showed it to be the tallest mountain above sea level. Peak XV was later named Mount Everest.
Visually impaired, but one of the finest mathematicians and physicists
Leonhard Euler is considered as one of the finest mathematicians and physicists of the eighteenth century. He became visually impaired in the last two decades of his life. He was able to do prodigious calculations in his head, which allowed him to publish many of his 886 papers and books.
Ada Lovelace – World’s first computer programmer
Ada Lovelace, the English mathematician and daughter of Lord Byron, was chiefly known for her work on Charles Babbage’s analytical machine, or the computer. She worked on the engine with notes of her own, which are recognized today as the world’s first computer programme.