Non-Euclidean geometry that are both perpendicular to a third line: Euclidean geometry, named after the Greek mathematician Euclid, includes some of the oldest known mathematics, and geometries that deviated from this were not widely accepted as legitimate until the 19th century. The debate that eventually led to the discovery of the non-Euclidean geometries began almost as soon as Euclid's work "Elements" was written. In the "Elements", Euclid began with a limited number of assumptions (23 definitions, five common notions, and five postulates) and sought to prove all the other results (propositions) in the work. The most notorious of the postulates is often
Greek Orthodox Patriarchate of Alexandria and all Africa visited first Uganda, and later Kenya. Spartas, however, also made contact with Fr Nikodemos Sarikas, a missionary priest in Tanganyika, and through him made contact with the Greek Patriarch of Alexandria. In 1946 the African Orthodox groups in Kenya and Uganda were received into the Greek Orthodox Patriarchate of Alexandria. In the 1950s, however, the Orthodox Church in Kenya suffered severe oppression at the hands of the British colonial authorities during the Mau Mau Uprising. Most of the clergy were put in concentration camps, and churches and schools were closed. Only the Cathedral in Nairobi (which had a largely Greek