Parallel (geometry) as a pair of straight lines in a plane which do not meet appears as Definition 23 in Book I of Euclid's Elements. Alternative definitions were discussed by other Greeks, often as part of an attempt to prove the parallel postulate. Proclus attributes a definition of parallel lines as equidistant lines to Posidonius and quotes Geminus in a similar vein. Simplicius also mentions Posidonius' definition as well as its modification by the philosopher Aganis. At the end of the nineteenth century, in England, Euclid's Elements was still the standard textbook in secondary schools. The traditional treatment of geometry was being
Transmission of the Greek Classics mid-12th century, and gathered men from Italy as well. Transmission of the Greek Classics The transmission of the Greek Classics to "Latin" Western Europe during the Middle Ages was a key factor in the development of intellectual life in Western Europe. Interest in Greek texts and their availability was scarce in the Latin West during the earlier Middle Ages, but as traffic to the East increased so did Western scholarship. Classical Greek philosophy consisted of various original works ranging from those from Ancient Greece (e.g. Aristotle) to those Greco-Roman scholars in the classical Roman Empire (e.g. Ptolemy). Though these works