# Dictionary Definition

Euclid n : Greek geometer (3rd century BC)

# Extensive Definition

Euclid (Greek: ), fl. 300 BC, also known as Euclid of Alexandria and the "Father of Geometry", was a Greek mathematician of the Hellenistic period who was active in Alexandria, almost certainly during the reign of Ptolemy I (323 BC283 BC). His Elements is the most successful textbook in the history of mathematics. In it, the principles of what is now called Euclidean geometry are deduced from a small set of axioms. Euclid also wrote works on perspective, conic sections, spherical geometry, and rigor.

## Biographical knowledge

Little is known about Euclid other than his writings. What little biographical information we do have comes largely from commentaries by Proclus and Pappus of Alexandria: Euclid was active at the great Library of Alexandria and may have studied at Plato's Academy in Greece. The date and place of Euclid's birth and the date and circumstances of his death are unknown.
Some writers in the Middle Ages confused him with Euclid of Megara, a Greek Socratic philosopher who lived approximately one century earlier.

## The Elements

Although many of the results in Elements originated with earlier mathematicians, one of Euclid's accomplishments was to present them in a single, logically coherent framework, making it easy to use and easy to reference, including a system of rigorous mathematical proofs that remains the basis of mathematics 23 centuries later.
Although best-known for its geometric results, the Elements also includes number theory. It considers the connection between perfect numbers and Mersenne primes, the infinitude of prime numbers, Euclid's lemma on factorization (which leads to the fundamental theorem of arithmetic on uniqueness of prime factorizations), and the Euclidean algorithm for finding the greatest common divisor of two numbers.
The geometrical system described in the Elements was long known simply as geometry, and was considered to be the only geometry possible. Today, however, that system is often referred to as Euclidean geometry to distinguish it from other so-called Non-Euclidean geometries that mathematicians discovered in the 19th century.

## Other works

In addition to the Elements, at least five works of Euclid have survived to the present day.
• Data deals with the nature and implications of "given" information in geometrical problems; the subject matter is closely related to the first four books of the Elements.
• On Divisions of Figures, which survives only partially in Arabic translation, concerns the division of geometrical figures into two or more equal parts or into parts in given ratios. It is similar to a third century AD work by Heron of Alexandria.
• Catoptrics, which concerns the mathematical theory of mirrors, particularly the images formed in plane and spherical concave mirrors. The attribution to Euclid is doubtful. Its author may have been Theon of Alexandria.
• Phaenomena is a treatise on spherical Astronomy, it survives in Greek and is quite similar to "On the Moving Sphere", by Autolycus of Pitane, who flourished around 310 BC.
• Optics is the earliest surviving Greek treatise on perspective. In its definitions Euclid follows the Platonic tradition that vision is caused by discrete rays which emanate from the eye. One important definition is the fourth: "Things seen under a greater angle appear greater, and those under a lesser angle less, while those under equal angles appear equal." In the 36 propositions that follow, Euclid relates the apparent size of an object to its distance from the eye and investigates the apparent shapes of cylinders and cones when viewed from different angles. Proposition 45 is interesting, proving that for any two unequal magnitudes, there is a point from which the two appear equal. Pappus believed these results to be important in astronomy and included Euclid's Optics, along with his Phaenomena, in the Little Astronomy, a compendium of smaller works to be studied before the Syntaxis (Almagest) of Claudius Ptolemy.
All of these works follow the basic logical structure of the Elements, containing definitions and proved propositions.
There are also works credibly attributed to Euclid which have been lost.
• Conics was a work on conic sections that was later extended by Apollonius of Perga into his famous work on the subject. It is likely that the first four books of Apollonius's work come directly from Euclid. According to Pappus, "Apollonius, having completed Euclid's four books of conics and added four others, handed down eight volumes of conics." The Conics of Apollonius quickly supplanted the former work, and by the time of Pappus, Euclid's work was already lost.
• Porisms might have been an outgrowth of Euclid's work with conic sections, but the exact meaning of the title is controversial.
• Pseudaria, or Book of Fallacies, was an elementary text about errors in reasoning.
• Surface Loci concerned either loci (sets of points) on surfaces or loci which were themselves surfaces; under the latter interpretation, it has been hypothesized that the work might have dealt with quadric surfaces.
• Several works on mechanics are attributed to Euclid by Arabic sources. On the Heavy and the Light contains, in nine definitions and five propositions, Aristotelian notions of moving bodies and the concept of specific gravity. On the Balance treats the theory of the lever in a similarly Euclidean manner, containing one definition, two axioms, and four propositions. A third fragment, on the circles described by the ends of a moving lever, contains four propositions. These three works complement each other in such a way that it has been suggested that they are remnants of a single treatise on mechanics written by Euclid.

## References

• Artmann, Benno (1999). Euclid: The Creation of Mathematics. New York: Springer. ISBN 0-387-98423-2.
• [p. 52].
• Heath, Thomas L. (1956). The Thirteen Books of Euclid's Elements, Vol. 1 (2nd ed.). New York: Dover Publications. ISBN 0-486-60088-2: includes extensive commentaries on Euclid and his work in the context of the history of mathematics that preceded him.
• Heath, Thomas L. (1981). A History of Greek Mathematics, 2 Vols. New York: Dover Publications. ISBN 0-486-24073-8 / ISBN 0-486-24074-6.
• Kline, Morris (1980). Mathematics: The Loss of Certainty. Oxford: Oxford University Press. ISBN 0-19-502754-X.
• .

Euclid in Arabic: إقليدس
Euclid in Asturian: Euclides
Euclid in Azerbaijani: Evklid
Euclid in Bengali: ইউক্লিড
Euclid in Bosnian: Euklid
Euclid in Breton: Euklides
Euclid in Bulgarian: Евклид
Euclid in Catalan: Euclides
Euclid in Czech: Eukleidés
Euclid in Danish: Euklid
Euclid in German: Euklid
Euclid in Modern Greek (1453-): Ευκλείδης
Euclid in Spanish: Euclides
Euclid in Esperanto: Eŭklido
Euclid in Persian: اقلیدس
Euclid in French: Euclide
Euclid in Galician: Euclides
Euclid in Classical Chinese: 歐几里得
Euclid in Korean: 에우클레이데스
Euclid in Armenian: Էվկլիդես
Euclid in Croatian: Euklid
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Euclid in Indonesian: Euklides
Euclid in Icelandic: Evklíð
Euclid in Italian: Euclide
Euclid in Hebrew: אוקלידס
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Euclid in Georgian: ევკლიდე
Euclid in Kirghiz: Евклид
Euclid in Latin: Euclides
Euclid in Latvian: Eiklīds
Euclid in Lithuanian: Euklidas
Euclid in Lombard: Eucliit da Megara
Euclid in Hungarian: Euklidész
Euclid in Maltese: Ewklide
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Euclid in Japanese: エウクレイデス
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Euclid in Piemontese: Uclid
Euclid in Polish: Euklides
Euclid in Portuguese: Euclides
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Euclid in Albanian: Euklidi
Euclid in Sicilian: Euclidi
Euclid in Simple English: Euclid
Euclid in Slovak: Euklides
Euclid in Slovenian: Evklid
Euclid in Serbian: Еуклид
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Euclid in Finnish: Eukleides
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Euclid in Thai: ยุคลิด
Euclid in Vietnamese: Euclid
Euclid in Tajik: Эвклид
Euclid in Turkish: Öklid
Euclid in Ukrainian: Евклід
Euclid in Urdu: اقلیدس
Euclid in Volapük: Eukleides
Euclid in Yiddish: אוקלידוס
Euclid in Chinese: 欧几里德