For those unwilling to click through, I.F. is Ivan Fesenko. Among other things, he wrote this article about Mochizuki's work: http://inference-review.com/artic

For those unwilling to click through, I.F. is Ivan Fesenko. Among other things, he wrote this article about Mochizuki's work: http://inference-review.com/article/fukugen http://inference-review.com/article/fukugen