digon

English

A digon with an internal area (the green portion) can be depicted on the surface of a sphere if its vertices are antipodal (on opposite sides of the sphere). On a flat surface, a digon would look like a line.

Etymology

di- +‎ -gon.

Pronunciation

  • Hyphenation: di‧gon

Noun

digon (plural digons)

  1. (geometry) A polygon having two edges and two vertices.
    • 2013, Brent Davis; Moshe Renert, The Math Teachers Know: Profound Understanding of Emergent Mathematics, New York, N.Y.; Abingdon, Oxon.: Routledge, →ISBN Invalid ISBN, page 102:
      They [the students] also came upon new and unusual mathematical figures: the digon, a two-sided polygon on a spherical space, and the apeirogon, an open polygon with infinitely many sides  […]. All these discoveries brought up even more questions. Is a circle a polygon? What makes an octagon an octagon – its eight vertices, its eight sides, or both? Can a polygon cross itself? Does a polygon need to be closed?
  2. (graph theory) A pair of parallel undirected edges in a multigraph.
  3. (graph theory) A pair of antiparallel edges in a directed graph.

Synonyms

Translations

Further reading

Anagrams

Esperanto

Noun

digon

  1. accusative singular of digo

Welsh

Etymology

From the stem of the verb digoni (“to suffice, to satisfy, to satiate”).

Pronunciation

  • (North Wales) IPA(key): /ˈdɪɡɔn/
  • (South Wales) IPA(key): /ˈdiːɡɔn/, /ˈdɪɡɔn/

Noun

digon m (uncountable)

  1. enough, plenty, a sufficient amount

Derived terms

Adverb

digon

  1. enough, sufficient

Mutation

Welsh mutation
radicalsoftnasalaspirate
digon ddigon nigon unchanged
Note: Some of these forms may be hypothetical. Not every
possible mutated form of every word actually occurs.
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