monogon

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English

Etymology

From mono- +‎ -gon.

Pronunciation

  • Audio (UK):(file)
  • Hyphenation: mon‧o‧gon

Noun

monogon (plural monogons)

  1. (geometry) A one-dimensional object comprising one vertex and one (not necessarily straight) edge both of whose ends are that vertex.
    • 1955, Herbert Busemann, The Geometry of Geodesics, page 295:
      A geodesic with multiple points contains at least one simple monogon.
    • 1981, Harold Abelson, Andrea A. DiSessa, Turtle Geometry: The Computer As a Medium for Exploring Mathematics, →ISBN, page 262:
      There are no one-sided closed polygons on a plane. On the cube, however, monogons are a diverse and interesting class of figures.
    • 2003, Gordon Baker, translator and editor, Ludwig Wittgenstein and Friedrich Waismann, The Voices of Wittgenstein: The Vienna Circle, Routledge, →ISBN, page 409,
      We explain to somebody what is a regular quadrilateral constructed within the circle; then a regular triangle and a regular bi-angle. Now we ask him to draw a regular monogon by analogy, and we probably think that he cannot do this. But what if he draws a point on the circle and says that it is a regular monogon?
  2. (geometry) A two-dimensional object comprising one vertex, one edge both of whose ends are that vertex, and one face filling in the hollow formed by that edge.
    • 1987, Jonathan L. Gross, Thomas W. Tucker, Topological Graph Theory, Dover Publications, published 2001, →ISBN, page 231:
      According to Theorem 4.1.1, such a derived imbedding could be obtained from an imbedded voltage graph with one vertex, edges, and faces. Of these faces, should be 3-sided and satisfy KVL. The other face should be a monogon whose net voltage has order two.
    • 2002, Tao Li, "Laminar Branched Surfaces in 3–manifolds", Geometry & Topology 6, page 158,
      There is no monogon in , ie, no disk with , where is in an interval fiber of and .
    • a. 2006, Thilo Kuessner, "A survey on simplicial volume and invariants of foliations and laminations", in, Paweł Walczak, et al., editors, Foliations 2005, →ISBN, page 295,
      An end-compressing monogon for F is a monogon properly embedded in the complimentary region C which is not homotopic (rel. boundary) into .
  3. (optics) A single-faceted reflector.
    • 1991, Beam Deflection, Scanning Technologies, edited by Gerald F. Marshall, Leo Beiser, →ISBN, page 33:
      A new optical scanner is described which serves as a monogon or single-facet device, providing one scan per shaft rotation.
    • 1999, William L. Wolfe, Infrared Design Examples, Tutorial Texts in Optical Engineering Volume TT36, SPIE Press, →ISBN, page 133,
      These devices also start with the monogon, a plane mirror, and include the bigon, a two-sided mirror, the trigon, quadrigon, and general n-gons.

Quotations

To be listed under the applicable sense
  • 2008, Baris Coskunuzer, Proceedings of the American Mathematical Society, volume 136, number 4, pages 1427–1432:
    As nonproper embeddedness must produce monogons, one can get a contradiction by using Hass and Scott's surgery arguments for least area objects in .

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