Euclid (Greek: Εὐκλείδης — Eukleídēs), fl. 300 BC, also known as Euclid of Alexandria, was a Greek mathematician and is often referred to as the Father of Geometry. He was active in Alexandria during the reign of Ptolemy I (323 BC – 283 BC). In his work Elements, the principles of what is now called Euclidean geometry were deduced from a small set of axioms. Euclid also wrote works on perspective, conic sections, spherical geometry, number theory and rigor.
- Elements, ed. by D. E. Joyce, trans. by Thomas Little Heath
- Elements (English and Greek), trans. by Thomas Little Heath
- The First Six Books of the Elements of Euclid, and Propositions I.-XXI. of Book XI., and an Appendix on the Cylinder, Sphere, Cone, Etc., With Copious Annotations and Numerous Exercises [Dublin: Hodges, Figgis and Co., 1890]
- The first six books of the elements of Euclid, in which coloured diagrams and symbols are used instead of letters for the greater ease of learners / Oliver Byrne