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,
Alexandria on the Caucasus the reign of Menander I the city was recorded as having a thriving Buddhist community, headed by Greek monks. In epic Sri Lankan poem Mahavamsa mentions the Greek (Pali: "Yona", lit: "Ionian") Buddhist monk Mahadhammarakkhita (), who is said to have come from “Alasandra” (thought to be Alexandria of the Caucasus), with 30,000 monks for the foundation ceremony of the Maha Thupa at Anuradhapura in Sri Lanka: Some archaeological evidence concerning Alexandria of the Caucasus was gathered by Charles Masson (1800–1853), providing insight into the history of that lost city. His findings include coins, rings, seals and other small objects.