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
History of the Patriarchs of Alexandria H. E. Burmester, in Cairo. In 1713 Eusèbe Renaudot published the Latin translation "Historia patriarcharum alexandrinorum jacobitarum". A scholarly Arabic edition was started by Christian Friedrich Seybold (1904). History of the Patriarchs of Alexandria The History of the Patriarchs of Alexandria is a major historical work of the Coptic Orthodox Church of Alexandria. It is written in Arabic, but draws extensively on Greek and Coptic sources. The compilation was based on earlier biographical sources. It was begun by Severus Ibn al-Muqaffaʿ, although one scholar contests its attribution to him. It was continued by others including Michael, bishop of Tinnis (11th