Semi-Cartesian squares and the Snake Lemma
Raoult, Jean-Claude
Original · EN
The well-known snake lemma is proved entirely within category theory, without the help of "points with value in..." à 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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