**Pappus of Alexandria** ( /ˈpæpəs/ ; Greek : Πάππος ὁ Ἀλεξανδρεύς; c. 290 – c. 350 AD) was one of the last great Greek mathematicians of antiquity, known for his *Synagoge* (Συναγωγή) or *Collection* (c. 340), and for Pappus's hexagon theorem in projective geometry. Nothing is known of his life, other than what can be found in his own writings: that he had a son named Hermodorus, and was a teacher in Alexandria.^{ [1] }

- Context
- Dating
- Works
- Collection
- Book VII
- Book VIII
- Legacy
- See also
- Notes
- References
- Further reading
- External links

*Collection*, his best-known work, is a compendium of mathematics in eight volumes, the bulk of which survives. It covers a wide range of topics, including geometry, recreational mathematics, doubling the cube, polygons and polyhedra.

Pappus was active in the 4th century AD. In a period of general stagnation in mathematical studies, he stands out as a remarkable exception.^{ [2] } "How far he was above his contemporaries, how little appreciated or understood by them, is shown by the absence of references to him in other Greek writers, and by the fact that his work had no effect in arresting the decay of mathematical science," Thomas Little Heath writes. "In this respect the fate of Pappus strikingly resembles that of Diophantus."^{ [2] }

In his surviving writings, Pappus gives no indication of the date of the authors whose works he makes use of, or of the time (but see below) at which he himself wrote. If no other date information were available, all that could be known would be that he was later than Ptolemy (died c. 168 AD), whom he quotes, and earlier than Proclus (born c. 411), who quotes him.^{ [2] }

The 10th century * Suda * states that Pappus was of the same age as Theon of Alexandria, who was active in the reign of Emperor Theodosius I (372–395).^{ [3] } A different date is given by a marginal note to a late 10th-century manuscript^{ [2] } (a copy of a chronological table by the same Theon), which states, next to an entry on Emperor Diocletian (reigned 284–305), that "at that time wrote Pappus".^{[ citation needed ]}

However, a real date comes from the dating of a solar eclipse mentioned by Pappus himself, when in his commentary on the * Almagest * he calculates "the place and time of conjunction which gave rise to the eclipse in Tybi in 1068 after Nabonassar". This works out as 18 October 320, and so Pappus must have been writing around 320.^{ [1] }

The great work of Pappus, in eight books and titled *Synagoge* or *Collection*, has not survived in complete form: the first book is lost, and the rest have suffered considerably. The * Suda * enumerates other works of Pappus: *Χωρογραφία οἰκουμενική* (* Chorographia oikoumenike * or *Description of the Inhabited World*), commentary on the four books of Ptolemy's * Almagest *, *Ποταμοὺς τοὺς ἐν Λιβύῃ* (*The Rivers in Libya*), and *Ὀνειροκριτικά* (*The Interpretation of Dreams*).^{ [3] } Pappus himself mentions another commentary of his own on the *Ἀνάλημμα* (* Analemma *) of Diodorus of Alexandria. Pappus also wrote commentaries on Euclid's *Elements* (of which fragments are preserved in Proclus and the Scholia, while that on the tenth Book has been found in an Arabic manuscript), and on Ptolemy's *Ἁρμονικά* (*Harmonika*).^{ [2] }

Federico Commandino translated the *Collection* of Pappus into Latin in 1588. The German classicist and mathematical historian Friedrich Hultsch (1833–1908) published a definitive 3-volume presentation of Commandino's translation with both the Greek and Latin versions (Berlin, 1875–1878). Using Hultsch's work, the Belgian mathematical historian Paul ver Eecke was the first to publish a translation of the *Collection* into a modern European language; his 2-volume, French translation has the title * Pappus d'Alexandrie. La Collection Mathématique* (Paris and Bruges, 1933).^{ [4] }

The characteristics of Pappus's *Collection* are that it contains an account, systematically arranged, of the most important results obtained by his predecessors, and, secondly, notes explanatory of, or extending, previous discoveries. These discoveries form, in fact, a text upon which Pappus enlarges discursively. Heath considered the systematic introductions to the various books as valuable, for they set forth clearly an outline of the contents and the general scope of the subjects to be treated. From these introductions one can judge of the style of Pappus's writing, which is excellent and even elegant the moment he is free from the shackles of mathematical formulae and expressions. Heath also found his characteristic exactness made his *Collection* "a most admirable substitute for the texts of the many valuable treatises of earlier mathematicians of which time has deprived us".^{ [2] }

The surviving portions of *Collection* can be summarized as follows.^{ [5] }

We can only conjecture that the lost **Book I**, like Book II, was concerned with arithmetic, Book III being clearly introduced as beginning a new subject.^{ [2] }

The whole of **Book II** (the former part of which is lost, the existing fragment beginning in the middle of the 14th proposition)^{ [2] } discusses a method of multiplication from an unnamed book by Apollonius of Perga. The final propositions deal with multiplying together the numerical values of Greek letters in two lines of poetry, producing two very large numbers approximately equal to 2×10^{54} and 2×10^{38}.^{ [6] }

**Book III** contains geometrical problems, plane and solid. It may be divided into five sections:^{ [2] }

- On the famous problem of finding two mean proportionals between two given lines, which arose from that of duplicating the cube, reduced by Hippocrates of Chios to the former. Pappus gives several solutions of this problem, including a method of making successive approximations to the solution, the significance of which he apparently failed to appreciate; he adds his own solution of the more general problem of finding geometrically the side of a cube whose content is in any given ratio to that of a given one.
^{ [2] } - On the arithmetic, geometric and harmonic means between two straight lines, and the problem of representing all three in one and the same geometrical figure. This serves as an introduction to a general theory of means, of which Pappus distinguishes ten kinds, and gives a table representing examples of each in whole numbers.
^{ [2] } - On a curious problem suggested by Euclid I. 21.
^{ [2] } - On the inscribing of each of the five regular polyhedra in a sphere.
^{ [2] }Here Pappus observed that a regular dodecahedron and a regular icosahedron could be inscribed in the same sphere such that their vertices all lay on the same 4 circles of latitude, with 3 of the icosahedron's 12 vertices on each circle, and 5 of the dodecahedron's 20 vertices on each circle. This observation has been generalised to higher dimensional dual polytopes.^{ [7] } - An addition by a later writer on another solution of the first problem of the book.
^{ [2] }

Of **Book IV** the title and preface have been lost, so that the program has to be gathered from the book itself. At the beginning is the well-known generalization of Euclid I.47 (Pappus's area theorem), then follow various theorems on the circle, leading up to the problem of the construction of a circle which shall circumscribe three given circles, touching each other two and two. This and several other propositions on contact, e.g. cases of circles touching one another and inscribed in the figure made of three semicircles and known as arbelos ("shoemakers knife") form the first division of the book; Pappus turns then to a consideration of certain properties of Archimedes's spiral, the conchoid of Nicomedes (already mentioned in Book I as supplying a method of doubling the cube), and the curve discovered most probably by Hippias of Elis about 420 BC, and known by the name, τετραγωνισμός, or quadratrix. Proposition 30 describes the construction of a curve of double curvature called by Pappus the helix on a sphere; it is described by a point moving uniformly along the arc of a great circle, which itself turns about its diameter uniformly, the point describing a quadrant and the great circle a complete revolution in the same time. The area of the surface included between this curve and its base is found – the first known instance of a quadrature of a curved surface. The rest of the book treats of the trisection of an angle, and the solution of more general problems of the same kind by means of the quadratrix and spiral. In one solution of the former problem is the first recorded use of the property of a conic (a hyperbola) with reference to the focus and directrix.^{ [8] }

In **Book V**, after an interesting preface concerning regular polygons, and containing remarks upon the hexagonal form of the cells of honeycombs, Pappus addresses himself to the comparison of the areas of different plane figures which have all the same perimeter (following Zenodorus's treatise on this subject), and of the volumes of different solid figures which have all the same superficial area, and, lastly, a comparison of the five regular solids of Plato. Incidentally Pappus describes the thirteen other polyhedra bounded by equilateral and equiangular but not similar polygons, discovered by Archimedes, and finds, by a method recalling that of Archimedes, the surface and volume of a sphere.^{ [8] }

According to the preface, **Book VI** is intended to resolve difficulties occurring in the so-called "Lesser Astronomical Works" (Μικρὸς Ἀστρονοµούµενος), i.e. works other than the * Almagest *. It accordingly comments on the *Sphaerica* of Theodosius, the *Moving Sphere* of Autolycus, Theodosius's book on *Day and Night*, the treatise of Aristarchus * On the Size and Distances of the Sun and Moon *, and Euclid's *Optics and Phaenomena*.^{ [8] }

Since Michel Chasles cited this book of Pappus in his history of geometric methods,^{ [9] } it has become the object of considerable attention.

The preface of **Book VII** explains the terms analysis and synthesis, and the distinction between theorem and problem. Pappus then enumerates works of Euclid, Apollonius, Aristaeus and Eratosthenes, thirty-three books in all, the substance of which he intends to give, with the lemmas necessary for their elucidation. With the mention of the *Porisms* of Euclid we have an account of the relation of porism to theorem and problem. In the same preface is included (a) the famous problem known by Pappus's name, often enunciated thus: Having given a number of straight lines, to find the geometric locus of a point such that the lengths of the perpendiculars upon, or (more generally) the lines drawn from it obliquely at given inclinations to, the given lines satisfy the condition that the product of certain of them may bear a constant ratio to the product of the remaining ones; (Pappus does not express it in this form but by means of composition of ratios, saying that if the ratio is given which is compounded of the ratios of pairs one of one set and one of another of the lines so drawn, and of the ratio of the odd one, if any, to a given straight line, the point will lie on a curve given in position); (b) the theorems which were rediscovered by and named after Paul Guldin, but appear to have been discovered by Pappus himself.^{ [8] }

Book VII also contains

- under the head of the
*De Sectione Determinata*of Apollonius, lemmas which, closely examined, are seen to be cases of the involution of six points;^{ [8] } - important lemmas on the
*Porisms*of Euclid,^{ [8] }including what is called Pappus's hexagon theorem;^{ [10] } - a lemma upon the
*Surface Loci*of Euclid which states that the locus of a point such that its distance from a given point bears a constant ratio to its distance from a given straight line is a conic, and is followed by proofs that the conic is a parabola, ellipse, or hyperbola according as the constant ratio is equal to, less than or greater than 1 (the first recorded proofs of the properties, which do not appear in Apollonius).^{ [8] }

Chasles's citation of Pappus was repeated by Wilhelm Blaschke ^{ [11] } and Dirk Struik.^{ [12] } In Cambridge, England, John J. Milne gave readers the benefit of his reading of Pappus.^{ [13] } In 1985 Alexander Jones wrote his thesis at Brown University on the subject. A revised form of his translation and commentary was published by Springer-Verlag the following year. Jones succeeds in showing how Pappus manipulated the complete quadrangle, used the relation of projective harmonic conjugates, and displayed an awareness of cross-ratios of points and lines. Furthermore, the concept of pole and polar is revealed as a lemma in Book VII.^{ [14] }

Lastly, **Book VIII** principally treats mechanics, the properties of the center of gravity, and some mechanical powers. Interspersed are some propositions on pure geometry. Proposition 14 shows how to draw an ellipse through five given points, and Prop. 15 gives a simple construction for the axes of an ellipse when a pair of conjugate diameters are given.^{ [8] }

Pappus's *Collection* was virtually unknown to the Arabs and medieval Europeans, but exerted great influence on 17th century mathematics after being translated to latin by Federico Commandino.^{ [15] } Diophantus's *Arithmetica* and Pappus's *Collection* were the two major sources of Viète's *Isagoge in artem analyticam* (1591).^{ [16] } The Pappus's problem and its generalization led Descartes to the development of analytic geometry.^{ [17] } Fermat also developed his version of analytic geometry and his method of Maxima and Minima from Pappus's summaries of Apollonius's lost works *Plane Loci* and *On Determinate Section*.^{ [18] } Other mathematicians influenced by Pappus were Pacioli, da Vinci, Kepler, van Roomen, Pascal, Newton, Bernoulli, Euler, Gauss, Gergonne, Steiner and Poncelet. ^{ [19] }

- 1 2 Pierre Dedron, J. Itard (1959)
*Mathematics And Mathematicians*, Vol. 1, p. 149 (trans. Judith V. Field) (Transworld Student Library, 1974) - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Heath 1911, p. 740.
- 1 2 Whitehead, David (ed.). "Suda On Line – Pappos". Suda On Line and the Stoa Consortium. Retrieved 11 July 2012.
Alexandrian, philosopher, born in the time of the elder emperor Theodosius, when the philosopher Theon also flourished, the one who wrote about Ptolemy’s Canon. His books are

*Description of the Inhabited World*; a commentary on the four books of the*Great Syntaxis*of Ptolemy;*The Rivers in Libya*; and*The Interpretation of Dreams*. - ↑ Smith, David Eugene (January 1934). "Review of
*Pappus d'Alexandrie. La Collection Mathématique*by Paul ver Eecke" (PDF).*Bull. Am. Math. Soc*.**40**(1): 11–12. doi: 10.1090/S0002-9904-1934-05766-5 . - ↑ Weaver, James Henry (1916). "Pappus. introductory paper".
*Bull. Amer. Math. Soc*.**23**(3): 127–135. doi: 10.1090/S0002-9904-1916-02895-3 . - ↑ Pappus of Alexandria, trans. into Latin by Friedrich Hultsch.
*Pappi Alexandrini collectionis quae supersunt*. Apud Weidmannos, 1877, pp. 19–29. - ↑ H. S. M. Coxeter (23 May 2012).
*Regular Polytopes*. Courier Corporation. p. 88 238. ISBN 978-0-486-14158-9. - 1 2 3 4 5 6 7 8 Heath 1911, p. 741.
- ↑ Michel Chasles (1837)
*Aperçu historique sur l'origine et le développement des méthodes en géométrie*, especially page 302; see also pages 12, 78, and 518. - ↑ Heath 1911b, p. 102.
- ↑ Wilhelm Blaschke (1948)
*Projektiva Geometrie*, page 140 - ↑ Dirk Struik (1953)
*Lectures in Analytic and Projective Geometry*, page 19, Addison-Wesley - ↑ Milne 1911.
- ↑ Jones 1986. sfn error: multiple targets (2×): CITEREFJones1986 (help)
- ↑ Marchisotto, E. (2002). The Theorem of Pappus: A Bridge between Algebra and Geometry. The American Mathematical Monthly, 109(6), 497-516. doi:10.2307/2695440
- ↑ Eric G Forbes, Descartes and the birth of analytic geometry, Historia Mathematica, Volume 4, Issue 2, 1977, Pages 141-151, https://doi.org/10.1016/0315-0860(77)90105-7.
- ↑ https://www.scientificamerican.com/article/the-invention-of-analytic-geometry/
- ↑ Mahoney, Michael S. “Fermat's Mathematics: Proofs and Conjectures.” Science, vol. 178, no. 4056, 1972, pp. 30–36. JSTOR, www.jstor.org/stable/1734005.
- ↑ AIP Conference Proceedings 1479, 9 (2012); https://doi.org/10.1063/1.4756049

**Euclid**, sometimes called **Euclid of Alexandria** to distinguish him from Euclid of Megara, was a Greek mathematician, often referred to as the "founder of geometry" or the "father of geometry". He was active in Alexandria during the reign of Ptolemy I. His *Elements* is one of the most influential works in the history of mathematics, serving as the main textbook for teaching mathematics from the time of its publication until the late 19th or early 20th century. In the *Elements*, Euclid deduced the theorems of what is now called Euclidean geometry from a small set of axioms. Euclid also wrote works on perspective, conic sections, spherical geometry, number theory, and mathematical rigour.

**Euclidean geometry** is a mathematical system attributed to Alexandrian Greek mathematician Euclid, which he described in his textbook on geometry: the *Elements*. Euclid's method consists in assuming a small set of intuitively appealing axioms, and deducing many other propositions (theorems) from these. Although many of Euclid's results had been stated by earlier mathematicians, Euclid was the first to show how these propositions could fit into a comprehensive deductive and logical system. The *Elements* begins with **plane geometry**, still taught in secondary school as the first axiomatic system and the first examples of mathematical proofs. It goes on to the solid geometry of three dimensions. Much of the *Elements* states results of what are now called algebra and number theory, explained in geometrical language.

Geometry arose as the field of knowledge dealing with spatial relationships. Geometry was one of the two fields of pre-modern mathematics, the other being the study of numbers (arithmetic).

**Robert Simson** was a Scottish mathematician and professor of mathematics at the University of Glasgow. The Simson line is named after him.

**Al-Ṣābiʾ Thābit ibn Qurrah al-Ḥarrānī** was a Syrian Arab mathematician, physician, astronomer, and translator who lived in Baghdad in the second half of the ninth century during the time of the Abbasid Caliphate.

The * Elements* is a mathematical treatise consisting of 13 books attributed to the ancient Greek mathematician Euclid in Alexandria, Ptolemaic Egypt c. 300 BC. It is a collection of definitions, postulates, propositions, and mathematical proofs of the propositions. The books cover plane and solid Euclidean geometry, elementary number theory, and incommensurable lines.

**Apollonius of Perga** was an Ancient Greek geometer and astronomer known for his work on conic sections. Beginning from the contributions of Euclid and Archimedes on the topic, he brought them to the state prior to the invention of analytic geometry. His definitions of the terms ellipse, parabola, and hyperbola are the ones in use today.

**Theon of Alexandria** was a Greek scholar and mathematician who lived in Alexandria, Egypt. He edited and arranged Euclid's *Elements* and wrote commentaries on works by Euclid and Ptolemy. His daughter Hypatia also won fame as a mathematician.

In mathematics, a **semicircle** is a one-dimensional locus of points that forms half of a circle. The full arc of a semicircle always measures 180°. It has only one line of symmetry. In non-technical usage, the term "semicircle" is sometimes used to refer to a half-disk, which is a two-dimensional geometric shape that also includes the diameter segment from one end of the arc to the other as well as all the interior points.

In geometry, the statement that the angles opposite the equal sides of an isosceles triangle are themselves equal is known as the * pons asinorum*, typically translated as "bridge of asses". This statement is Proposition 5 of Book 1 in Euclid's

In mathematics, **Pappus's hexagon theorem** states that

**Greek mathematics** refers to mathematics texts written during and ideas stemming from the Archaic through the Hellenistic and Roman periods, mostly extant from the 7th century BC to the 4th century AD, around the shores of the Eastern Mediterranean. Greek mathematicians lived in cities spread over the entire Eastern Mediterranean from Italy to North Africa but were united by Greek culture and the Greek language. The word "mathematics" itself derives from the Ancient Greek: μάθημα, romanized: *máthēma*Attic Greek: [má.tʰɛː.ma]Koine Greek: [ˈma.θi.ma], meaning "subject of instruction". The study of mathematics for its own sake and the use of generalized mathematical theories and proofs is an important difference between Greek mathematics and those of preceding civilizations.

A **porism** is a mathematical proposition or corollary. In particular, the term **porism** has been used to refer to a direct consequence of a proof, analogous to how a corollary refers to a direct consequence of a theorem. In modern usage, a **porism** is a relation that holds for an infinite range of values but only if a certain condition is assumed, for example, Steiner's porism. The term originates from three books of Euclid with porism, that have been lost. Note that a proposition may not have been proven, so a porism may not be a theorem, or for that matter, it may not be true.

**Michel Floréal Chasles** was a French mathematician.

In Euclidean plane geometry, **Apollonius's problem** is to construct circles that are tangent to three given circles in a plane (Figure 1). Apollonius of Perga posed and solved this famous problem in his work Ἐπαφαί ; this work has been lost, but a 4th-century AD report of his results by Pappus of Alexandria has survived. Three given circles generically have eight different circles that are tangent to them (Figure 2), a pair of solutions for each way to divide the three given circles in two subsets.

**Federico Commandino** was an Italian humanist and mathematician.

**Hypsicles** was an ancient Greek mathematician and astronomer known for authoring *On Ascensions* (Ἀναφορικός) and the Book XIV of Euclid's *Elements*. Hypsicles lived in Alexandria.

This is a **timeline of ancient Greek mathematicians**.

* The Ancient Tradition of Geometric Problems* is a book on ancient Greek mathematics, focusing on three problems now known to be impossible if one uses only the straightedge and compass constructions favored by the Greek mathematicians: squaring the circle, doubling the cube, and trisecting the angle. It was written by Wilbur Knorr (1945–1997), a historian of mathematics, and published in 1986 by Birkhäuser. Dover Publications reprinted it in 1993.

- Heath, Thomas Little (1911).
*Encyclopædia Britannica*.**22**(11th ed.). Cambridge University Press. pp. 102–103.CS1 maint: date and year (link) . In Chisholm, Hugh (ed.). - Jones, Alexander (1986). "part 1: introduction, text, translation".
*Book 7 of the Collection*. Springer-Verlag. ISBN 0-387-96257-3.- Jones, Alexander (1986). "part 2: commentary, index, figures".
*Book 7 of the Collection*. Springer-Verlag. ISBN 3-540-96257-3.

- Jones, Alexander (1986). "part 2: commentary, index, figures".
- Milne, John J. (1911).
*An Elementary Treatise on Cross-Ratio Geometry with Historical Notes*. Cambridge University Press. p. 11.

**Attribution:**

- This article incorporates text from a publication now in the public domain : Heath, Thomas Little (1911). "Pappus of Alexandria". In Chisholm, Hugh (ed.).
*Encyclopædia Britannica*.**20**(11th ed.). Cambridge University Press. pp. 470–471.

- Jones, Alexander Raymond (19 January 2017). "Pappus of Alexandria".
*Encyclopædia Britannica*. - "Pappus of Alexandria (lived c. AD 200–350)".
*The Hutchinson Dictionary of Scientific Biography*. Helicon Publishing. 2004.Greek mathematician, astronomer, and geographer whose chief importance lies in his commentaries on the mathematical work of his predecessors

- Eecke, Paul Ver (1933).
*Pappus d'Alexandrie: La Collection Mathématique avec une Introduction et des Notes*(2 volumes Fondation Universitaire de Belgique ed.). Paris: Albert Blanchard.

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