Einstein's Zurich Notebook containing his private calculations related to his search for general relativity trying to incorporate gravity into his works of 1905. The notebooks were written between summer of 1912 to early 1913 and were found after his death in 1955. [Source: Einstein's Archive]Prof. John Norton of the Department of History and Philosophy of Science at University of Pittsburgh has tried to decode and explain all the equations and scribbles on the notebooks. source










