, he was invited to Cambridge by G.H. Hardy, on the basis of a letter containing some hundred theorems.  
His time spent at Trinity College was miserable, thanks to tuberculosis and malnutrition caused by his vegetarianism.  In 1976, George Andrews of Penn State discovered this man's "Lost Notebook," containing 600 theorems on loose sheets of paper.  A failed student at Madras University, he was invited to Cambridge by G.H. Hardy, on the basis of a letter containing some hundred theorems.  FTP, name this Indian who taught himself mathematics from an elementary English textbook.
His time spent at Trinity College was miserable, thanks to tuberculosis and malnutrition caused by his vegetarianism.  
Srinivasa Ramanujan