SUMMARY OF LETTERS TO PARTICIPANTS OF THE WORKSHOP ON THE THEORY OF SHINICHI MOCHIZUKI, DECEMBER 7 11 2015, OXFORD
3. Prerequisites for the workshop. They are mentioned or reviewed in sect. 1 of [17] class field theory, especially local class field theory; elliptic curves over finite, local and global fields, some basic things about the set of Diophantine geometry conjectures the theory of Mochizuki deals with, basics of (classical) anabelian geometry. For the latter Ch.4 of [21] is a very easy to read source. A very short paper [1] elegantly proves a local version which involves higher ramification filtration, the result plays a role in IUT theory.