Relativity: The Special and the General Theory (German: Über die spezielle und die allgemeine Relativitätstheorie) is a popular science book by Albert Einstein. It began as a short paper and was eventually expanded into a book written with the aim of explaining the special and general theories of relativity. It was published in German in 1916 and translated into English in 1920.[1][2][3] It is divided into three parts, the first dealing with special relativity, the second dealing with general relativity, and the third dealing with cosmology.[4]
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