The Cahiers de Topologie et Géométrie Différentielle Catégoriques (French: Notebooks of categorical topology and categorical differential geometry) is a French mathematical scientific journal established by Charles Ehresmann in 1957.

[1][2] It concentrates on category theory "and its applications, [e]specially in topology and differential geometry".

Its older papers (two years or more after publication) are freely available on the internet through the French NUMDAM service.

In the eighth volume he changed the name to Cahiers de Topologie et Géométrie Différentielle.

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