Alexander Alexandrovich Friedman or Friedmann (Александр Александрович Фридман) (June 16, 1888 – September 16, 1925) was a Russian cosmologist and mathematician. He discovered the expanding-universe solution to general relativity field equations in 1922, which was proved by Edwin Hubble's observations in 1929. Friedmann's 1924 papers, including "Uber die Moglichkeit einer Welt mit konstanter negativer Krummung des Raumes" (About the possibility of a world with constant negative curvature) published by the Brussels Academy of Sciences on the 7 January 1924, demonstrated that he had command of all three Friedmann models describing positive, zero and negative curvature respectively, a decade before Robertson and Walker published their analysis. June 16 is the 167th day of the year in the Gregorian calendar (168th in leap years), with 198 days remaining. ... 1888 is a leap year starting on Sunday (click on link for calendar). ... September 16 is the 259th day of the year (260th in leap years). ... 1925 was a common year starting on Thursday (link will take you to calendar). ... Cosmology, from the Greek: κοσμολογία (cosmologia, κόσμος (cosmos) world + λογια (logia) discourse) is the study of the universe in its totality and by extension mans place in it. ... A mathematician is a person whose area of study and research is mathematics. ... The Friedman equations relate various cosmological parameters within the context of general relativity. ... Two-dimensional visualization of space-time distortion. ... 1922 was a common year starting on Sunday (see link for calendar). ... Edwin Hubble Edwin Powell Hubble (November 20, 1889 – September 28, 1953) was an American astronomer, noted for his discovery of galaxies beyond the Milky Way and the cosmic red shift. ... 1929 was a common year starting on Tuesday (link will take you to calendar). ... 1924 was a leap year starting on Tuesday (link will take you to calendar). ... January 7 is the 7th day of the year in the Gregorian calendar. ... 1924 was a leap year starting on Tuesday (link will take you to calendar). ...

Alexander Friedmann lived much of his life in Leningrad. He fought in World War I (on behalf of Russia) as a bomber. Friedmann later lived through the thick of the russian revolution. Friedmann died young at age 37 due to typhoid fever. He also taught the other famous physicist George Gamow. Saint Petersburg (Russian: Санкт-Петербу́рг, English transliteration: Sankt-Peterburg), colloquially known as Питер (transliterated Piter), formerly known as Leningrad (Ленингра́д, 1924–1991) and Petrograd (Петрогра́д, 1914–1924), is a city located in Northwestern Russia on the Gulf of Finland of the Baltic Sea. ... World War I was primarily a European conflict with many facets: immense human sacrifice, stalemate trench warfare, and the use of new, devastating weapons - tanks, aircraft, machineguns, and poison gas. ... The phrase Russian Revolution can refer to the following events in the history of Russia. ... This is about the disease typhoid fever. ... George Gamow (pronounced GAM-off), born Georgiy Antonovich Gamow (Георгий Антонович Гамов) (March 4, 1904 – August 19, 1968) was a Ukrainian born physicist and cosmologist. ...

External link

• Biography at the MacTutor archive