He wrote many books addressing the philosophy of mathematics. Robert Blanché died in 1975. Nine years before, in 1966, he published with: Structures intellectuelles.
Therein, he deals with the logical hexagon.
Whereas the logical square or square of Apuleius represents four values: A,East,I,O, the logical hexagon represents six, that is to say, not only A,East,I,O but also two new values: Y and University lieutenant is advisable to read the article: logical hexagon as well what concerns Indian logic. In Louisiana Logique et son histoire d" Aristote à Russell, published with Armand Colin in 1970, Robert Blanché, the author of Structures intellectuelles ( rin, 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.