20/05/02 13:47:40 qpZJrq8I.net
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URLﾘﾝｸ(carmonamateo.github.io)
A letter from Mochizuki to Mateo Carmona 13.11.2017
(抜粋)
Dear Carmona,
There is a very substantive mathematical difference between the theory of Galois categories/topoi as developed in SGA1/SGA4 and the theory of anabelioids as developed in my paper "The Geometry of Anabelioids":
Namely, the notion of slimness allows one to work with 1-categories of (slim) anabelioids, whereas the theory of Galois categories/topoi as developed in SGA1/SGA4 gives rise to 2-categories of Galois categories/topoi.
In particular, "Galois groups" (i.e., in the classical sense) arise naturally as groups of 1-morphisms in 1-categories of slim anabelioids, which is a very substantive mathematical difference from the way in
which they arise in 2-categories of Galois categories/topoi, i.e., as groups of 2-morphisms in 2-categories.
This difference between 1- vs. 2-categories or 1- vs. 2-morphisms plays a fundamental role in the theory of anabelioids (as developed both in my paper "The Geometry of Anabelioids",