Pons asinorum

Pons asinorum (Latin for "bridge of asses") is the name given to Euclid's fifth proposition in Book 1 of his Elements of geometry, also known as the theorem on isosceles triangles. It states that the angles opposite the equal sides of an isosceles triangle are equal. Another medieval term for the theorem was Elefuga which, according to Roger Bacon, comes from Greek elegia misery, and fuga Latin for flight, that is "flight of the wretches". Though this etymology is dubious, it is echoed in Chaucer's use of the term "flemyng of wreches" for the theorem.[1]

There are two possible explanations for the name pons asinorum, the simplest being that the diagram used resembles an actual bridge. But the more popular explanation is that it is the first real test in the Elements of the intelligence of the reader and as a bridge to the harder propositions that follow.[2]

Whatever its origin, the term is also used as a metaphor for a problem or challenge which will separate the sure of mind from the simple, the fleet thinker from the slow, the determined from the dallier; to represent a critical test of ability or understanding.[3]

Contents

Metaphorical use

Uses of the term or the theorem itself as a metaphor include:

Dulcarnon

Similarly, the name Dulcarnon is given to the 47th proposition of Book I of Euclid, better known as the Pythagorean theorem, after the Arabic Dhū 'l qarnain ذُو ٱلْقَرْنَيْن, meaning "the owner of the two horns", because diagrams of the theorem showed two smaller squares like horns at the top of the figure. The term is also used as a metaphor for a dilemma.[1] The theorem was also sometimes called "the Windmill" for similar reasons.[7]

References

  1. ^ a b c d A. F. West & H. D. Thompson "On Dulcarnon, Elefuga And Pons Asinorum as Fanciful Names For Geometrical Propositions" The Princeton University bulletin Vol. 3 No. 4 (1891) p. 84
  2. ^ D.E. Smith History of Mathematics (1958 Dover) p. 284
  3. ^ Pons asinorum - Definition and More from the Free Merriam
  4. ^ W.E. Aytoun (Ed.) The poetical works of Thomas Campbell (1864, Little, Brown) p. 385 Google Books
  5. ^ H.D. Macleod The Elements of Economics (1886 D. Appleton) Vol. 2 p. 96
  6. ^ http://yle.fi/alueet/satakunta/2011/03/aasinsilta_on_laiskurin_apuneuvo_2395900.html
  7. ^ Charles Lutwidge Dodgson, Euclid and his Modern Rivals Act I Scene II §1

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