From Ohkawa to strong generation via approximable triangulated categories -- a variation on the theme of Amnon Neeman's Nagoya lecture series

This survey stems from Amnon Neeman’s lecture series at Ohakawa’s memorial workshop. Starting with Ohakawa’s theorem, this survey intends to supply enough motivation, background and technical details to read Neeman’s recent papers on his “approximable triangulated categories” and his $D_{coh}^b(X)$ strong generation sufficient criterion via de Jong’s regular alteration, even for non-experts. At the same time, the author, who happens to be a coorganizer of this workshop and an editor of the follow-up proceedings to be published as a series in Springer Proceedings in Mathematics and Statistics, repeatedly mentioned rich mathematical interaction with other papers in the proceedings, whenever appropriate.