Semi-Cartesian squares and the Snake Lemma

11 Nov 2017  ·  Raoult Jean-Claude ·

The well-known snake lemma is proved entirely within category theory, without the help of "points with value in..." \`a la Grothendieck, nor pseudo-elements as in Guglielmetti & Zaganidis. Instead, we define and use consistently semi-cartesian squares, which were promoted by C. Chevalley...

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