Pappus

Pappus

Pappus, Samenkrone, der den bleibenden oberen Kelch der Blümchen einer zusammengesetzten Blume andeutende, aus Federn, Haaren, Spreublättchen etc. bestehende Aufsatz des Samens.


Pierer's Lexicon. 1857–1865.

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  • Pappus — may refer to:*Pappus (flower structure), a type of flower structure *Pappus of Alexandria, Greek mathematician …   Wikipedia

  • Pappus — Pap pus, n. [L., an old man or grandfather; hence, a substance resembling gray hairs, Gr. ?.] (Bot.) The hairy or feathery appendage of the achenes of thistles, dandelions, and most other plants of the order {Composit[ae]}; also, the scales, awns …   The Collaborative International Dictionary of English

  • pappus — noun (plural pappi) Etymology: Latin, from Greek pappos Date: circa 1704 an appendage or tuft of appendages that crowns the ovary or fruit in various seed plants and functions in dispersal of the fruit …   New Collegiate Dictionary

  • Pappus of Alexandria — (Greek polytonic|Πάππος ὁ Ἀλεξανδρεύς) (c. 290 ndash; c. 350) was one of the last great Greek mathematicians of antiquity, known for his Synagoge or Collection (c. 340), and for Pappus s Theorem in projective geometry. Nothing is known of his… …   Wikipedia

  • Pappus's hexagon theorem — (attributed to Pappus of Alexandria) states that given one set of collinear points A , B , C , and another set of collinear points a , b , c , then the intersection points x , y , z of line pairs Ab and aB , Ac and aC , Bc and bC are collinear. ( …   Wikipedia

  • Pappus's centroid theorem — (also known as the Guldinus theorem, Pappus Guldinus theorem or Pappus s theorem) is the name of two related theorems dealing with the surface areas and volumes of surfaces and solids of revolution.The theorem is attributed to Pappus of… …   Wikipedia

  • Pappus configuration — In projective geometry, the Pappus configuration consists of a pair (( A , B , C ), ( D , E , F )) of triplets of points, which pair is located either on a pair of lines or on two sides of a conic section, with a hexagon AECDBF defined on the… …   Wikipedia

  • Pappus chain — In geometry, the Pappus chain was created by Pappus of Alexandria in the 3rd century AD.ConstructionThe arbelos is defined by two circles, C U and C V, which are tangent at the point A and where C U is enclosed by C V. Let the radii of these two… …   Wikipedia

  • Pappus graph — infobox graph name = Pappus graph image caption = The Pappus graph, a Levi graph with 18 vertices formed from the Pappus configuration. namesake = Pappus of Alexandria vertices = 18 edges = 27 chromatic number = chromatic index = properties =… …   Wikipedia

  • Pappus (flower structure) — In a composite flower, Pappus is the part of individual disk and ray flowers that surrounds the base, in the same manner as the calyx does in a non compound flower. The pappus may be like bristles or tiny hairs, teeth, or scales, and is usually… …   Wikipedia

  • Theorem of Pappus — Theorem The o*rem, n. [L. theorema, Gr. ? a sight, speculation, theory, theorem, fr. ? to look at, ? a spectator: cf. F. th[ e]or[ e]me. See {Theory}.] 1. That which is considered and established as a principle; hence, sometimes, a rule. [1913… …   The Collaborative International Dictionary of English

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