This is a book I bought when I was a student. Professor Iwasaki used a kind of dialectic to construct his own philosophical system. This book deeply examines that dialectic. The box shows signs of aging (yellowing) and some wear, but the book itself is clean with no writing, and is in very good condition for a used book. Please understand that this is a used item before purchasing. I will package it in waterproof packaging and ship it via Mercari delivery service.