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,
Tomb of Alexander the Great 4th or early 3rd century BC Alexander's body was transferred from the Memphis tomb to Alexandria for reburial (by Ptolemy Philadelphus in , according to Pausanias). Later Ptolemy Philopator placed Alexander's body in Alexandria's communal mausoleum. The mausoleum was called the Soma or Sema, which means "body" in Greek. By 274 BC Alexander was already entombed in Alexandria. The Tomb of Alexander became the focal point for the Ptolemaic cult of Alexander the Great. In 48 BC Alexander's tomb was visited by Caesar. To finance her war against Octavian, Cleopatra took gold from the tomb. Shortly after the death of