Foundations of geometry different sets of axioms for Euclidean geometry, any of these can replace the Euclidean parallel postulate. The following partial list indicates some of these theorems that are of historical interest. Absolute geometry is a geometry based on an axiom system consisting of all the axioms giving Euclidean geometry except for the parallel postulate or any of its alternatives. The term was introduced by János Bolyai in 1832. It is sometimes referred to as neutral geometry, as it is neutral with respect to the parallel postulate. In Euclid's "Elements", the first 28 propositions and Proposition I.31 avoid using the parallel postulate,
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