Final Answers
© 2000-2022 Gérard P. Michon, Ph.D.

Topoi

On the delusion of absolute rigor:

Chaque époque vit dans l'illusion qu'elle crée
la rigueur absolue. Chaque époque se trompe.

Pierre Cartier (2014)

Michon
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Related articles on this site:

Related Links (Outside this Site)

What is a Topos? (AMS, Oct. 2004) by Luc Illusie (1940-, Ph.D. 1971).
Topos Theory in a Nutshell (2005年04月12日) by John C. Baez (1960-).
An informal introduction to topos theory (2010, 2011) by Tom Leinster.


Blogs & Forums : Topos in nLab.
Sean Moss reviews (2014) "On a Topological Topos" by Peter Johnstone.

Wikipedia : History of topos theory | Topos

Bibliography :
"Topos Theory" (1977) by Peter T. Johnstone (1948-).
"Toposes, Triples and Theories" (1985, 2005) Michael Barr, Charles Wells.
"Topoi: The Categorial Analysis of Logic" (2006) by Robert Goldblatt.

Videos : A topos for algebraic quantum theory by Chris Heunen (January 2008, Imperial College London).
Olivia Caramello interviewed by Stéphane Dugowson & Anatole Khelif (2014).
Olivia Caramello (3:06) (Laurence Honorat, 2014年10月16日).

Topos: Opening Lecture (1:06:35) by Pierre Cartier (IHES, 2015年11月23日).
Crash course in topos theory [ 1 | 2 | 3 | 4 ] by André Joyal (IHES, 2015).
Categorial logic, classifying toposes & bridge technique, by Olivia Caramello
(IHES, 2015年11月23日) [ 1:19:28 | 1:19:59 | 1:16:24 | 1:17:49 ]
Panel (1:04:30) Olivia Caramello, André Joyal, Laurent Lafforgue, Alain Connes.

Toposes: Nice Places to Do Math (2:01) MathProofsable (2017年01月09日).
Topos and Information (1:18:05) by Daniel Bennequin (IHES, 2018年04月12日).
Grothendieck's 1973 topos lectures (1:31:08) by Colin McLarty (2018年05月03日).
Glances at topos theory [ 1 | 2 | 3 | 4 | 5 | 6 ] by Francis Borceux (2018年09月20日).

La notion unificatrice de topos (2:06:28) by Olivia Caramello (2018年03月06日).
Un topo sur les topos (1:57:30) by Alain Connes (in French, 2018年10月07日).
Topos de Grothendieck (37:09) by Stéphane Dugowson (December 2014).

Synthetic prequantum field theory (1:16:12) by Urs Schreiber (2015年12月03日).

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Topos

The ideas of topos was born on Monday, April 21, 1958
[from a remark made by Grothendieck after a lecture of Serre]
Colin McLarty (1951-)

(2019年01月15日) Presheaf & Sheaf (French: préfaisceau & faisceau).
If something occurs, it occurs on a neighborhood of every point.

A sheaf on a topological space [画像: Come back later, we're still working on this one... ]

Sheaf | Stalk

Introduction to Sheaf Theory (57:39) by Geoff Vooys (2018年10月12日).


Niels Bohr (2014年12月25日) Bohr Topos
Underlies Jordan algebras.

Pascual Jordan
Pascual Jordan
1902-1980
In 1932, Pascual Jordan tried to isolate some axioms that an "algebra of observables" should satisfy when associativity is not assumed (cf. nLab).

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Jordan algebras
Bohr topos and quantization (Math Overflow, 2013)


(2015年01月25日) Elementary Topos (Lawvere)

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Francis William Lawvere (1937-)


(2015年01月25日) Grothendieck topos.
Sites.

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History of topos theory | Alexander Grothendieck (1928-2014)


(2015年01月25日) Classifying Topoi
Add all possible imaginary concepts.

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Classifying topos


(2015年01月25日) Kochen-Specker theorem ("KS", 1967)
Definite values would violate the relations between physical quantities.

Using a topos perspective in 1998, Chris J. Isham (1944-) and Jeremy Butterfield (1954-) have stated the KS theorem thusly: It's impossible to assign values to all physical quantities whilst preserving the functional relations between them.

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Kochen-Specker theorem (KS) | Simon B. Kochen (1934-) | Ernst Specker (1920-2011)

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