Robert Blanché

From Wikipedia, the free encyclopedia
Jump to: navigation, search

Robert Blanché (1898–1975) was an associate professor of philosophy at the University of Toulouse. He wrote many books addressing the philosophy of mathematics.

About Structures intellectuelles[edit]

The logical hexagon, co-discovered independently by Blanché and Augustin Sesmat extends the square of opposition to six statements.

Robert Blanché died in 1975. Nine years before, in 1966, he published with Vrin: Structures intellectuelles. Therein, he deals with the logical hexagon. Whereas the logical square or square of Apuleius represents four values: A,E,I,O , the logical hexagon represents six, that is to say, not only A,E,I,O but also two new values: Y and U. It is advisable to read the article: logical hexagon as well what concerns Indian logic. In La Logique et son histoire d' Aristote à Russell, published with Armand Colin in 1970, Robert Blanché, the author of Structures intellectuelles ( Vrin, 1966) mentions that Józef Maria Bocheński speaks of a sort of Indian logical triangle to be compared with the square of Aristotle (or square of Apuleius), in other words with the square of opposition. This logical triangle announces the logical hexagon of Blanché. It seems that with this logical triangle, Indian logic proposes a useful approach to the problem raised by the particular propositions of natural language. If Robert Blanché's logical hexagon is something more complete and therefore more powerful as regards the understanding of the relationship between logic and natural language, it may be that on a highly important point, Indian logic is superior to that logic proceeding from Aristotle.


  • La Notion de fait psychique, essai sur les rapports du physique et du mental – 1934, ed. PUF.
  • Le Rationalisme de Whewell – 1935, ed. PUF.
  • Whewell : de la construction de la science – 1938, ed. J. Vrin
  • La Science physique et la réalité : réalisme, positivisme, mathématisme - 1948, ed. PUF
  • Les Attitudes idéalistes – 1949, ed. PUF
  • L’Axiomatique – 1955, ed. P.U.F. coll. Quadrige, 112p.
  • Introduction à la logique contemporaine - 1957, ed. Armand Colin, coll Cursus, 205p.
  • Structures intellectuelles, essai sur l’organisation systématique des concepts - 1966, ed. J. Vrin
  • Raison et discours, défense de la logique réflexive – 1967, ed. J. Vrin
  • La science actuelle et le rationalisme - 1967, Ed. PUF.
  • La Méthode expérimentale et la philosophie de la physique – 1969, ed. Armand Collin, 384p
  • La logique et son histoire d’Aristote à Russell, ed. Amand Colin, coll. U, Paris, 1970, 366p.
  • La Logique et son histoire, (avec Jacques Dubucs), ed. Amand Colin, coll. U, Paris, 1996, 396p. (édition revue de 1970)
  • L’Épistémologie - 1972 ; ed. PUF
  • Le Raisonnement – 1973, ed. PUF
  • L’Induction scientifique et les lois naturelles – 1975, ed. PUF