https://beet-aizu.hatenablog.com/entry/2019/10/20/150649
This page is auto-translated from /nishio/最小費用流の双対 using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I’m very happy to spread my thought to non-Japanese readers.