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Bourbaki harmful bend image – Wikipedia

Bourbaki harmful bend image – Wikipedia

2023-12-29 14:19:21

From Wikipedia, the free encyclopedia

Typological image representing problem

French “virages dangereux” street signal, earlier than 1949

The harmful bend or warning image (U+2621 CAUTION SIGN) was created by the Nicolas Bourbaki group of mathematicians and seems within the margins of mathematics books written by the group. It resembles a road sign that signifies a “harmful bend” within the street forward, and is used to mark passages tough on a primary studying or with an particularly troublesome argument.[1]

Certains passages sont destinés à prémunir le lecteur contre des erreurs graves, où il risquerait de tomber ; ces passages sont signalés en marge par le signe ☡ (« tournant dangereux »)

Some passages are designed to forewarn the reader in opposition to critical errors, the place he dangers falling; these passages are indicated within the margin with the signal ☡ (“harmful bend”)

Nicolas Bourbaki’s description of the image in a number of textbooks[2]

Variations[edit]

Others have used variations of the image of their books. The pc scientist Donald Knuth launched an American-style road-sign depiction in his Metafont and TeX techniques, with a pair of adjoining indicators indicating doubly harmful passages.[3][4][5][6]

See Also

Typography[edit]

Knuth’s “Harmful Bend” signal

Within the LaTeX typesetting system, Knuth’s harmful bend image could be produced by
first loading the font manfnt (a font with additional symbols utilized in Knuth’s TeX guide) with

usepackage{manfnt}

after which typing

dbend

There are a number of variations given by lhdbend, reversedvideodbend, textdbend, textlhdbend, and textreversedvideodbend.

See additionally[edit]

References[edit]

  1. ^ Steven G. Krantz (2011), The Proof Is in the Pudding: The Changing Nature of Mathematical Proof, Springer, ISBN 0-387-48908-8, p. 92.
  2. ^ See, for instance, Théorie des ensembles, p. I-8.
  3. ^ Donald Ervin Knuth (1986), The METAFONTbook, Addison-Wesley, ISBN 0-201-13445-4.
  4. ^ Donald Ervin Knuth (1984), The TeXbook, Addison-Wesley, ISBN 0-201-13448-9.
  5. ^ George J. Tourlakis (2003), Lectures in Logic and Set Theory, Volume 2: Set Theory, Cambridge College Press, ISBN 0-521-75374-0, p. xiv.
  6. ^ Gerard P. Michon (2012), Dangerous Bend Symbol, doubled and tripled, Numericana.

Exterior hyperlinks[edit]


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