Tannaka-Krein 1938 / Saavedra 1972 / Deligne 1990: reconstruct algebraic-group from its category of representations. Tensor + duality + fiber-functor. Foundation of motives + Galois-categories.
Tannaka-Krein 1938 / Saavedra 1972 / Deligne 1990: reconstruct algebraic-group from its category of representations. Tensor + duality + fiber-functor. Foundation of motives + Galois-categories.