УМФ 13.

Round-1 cut it for 'no subject in title'; round-2 re-check found the title names the course/subject (Mathematical physics equations (UMF)). Channel already vetted in round 1.

A 116-minute video from Лекторий ФПМИ: “УМФ 13.”.

Video by Лекторий ФПМИ, played through YouTube's embedded player.