Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Srinivasa Ramanujan''s lost notebook is the manuscript in which Ramanujan, a widely admired Indian mathematician from Cambridge University, recorded the mathematical discoveries of the last year of his life. It was rediscovered by George Andrews in 1976, in a box of effects of G. N. Watson stored at the Wren Library at Trinity College, Cambridge. The "notebook" is not a book, but consists of 87 loose and unordered sheets of paper, with more than 600 of Ramanujan''s formulas.George E. Andrews and Bruce C. Berndt (2005, 2009) have published several books in which they give proofs for Ramanujan''s formulas included in the notebook. Berndt says of the notebooks'' discovery: "The discovery of this ''Lost Notebook'' caused roughly as much stir in the mathematical world as the discovery of Beethoven''s tenth symphony would cause in the musical world."(Peterson 2006).