Тайны древности. Затерянный город пиратов.

Добро пожаловать в опасное плавание по Карибскому морю в поисках приключений и наживы...[Вы]... узнаете подлинную историю пиратов знаменитого Порт-Роял.

https://www.youtube.com/watch?v=cA9Zkad8cfs

MF205: Negative numbers, msets, and modern physics (English)

...how do we extend that to an arithmetic with integers? Can we do it in a better way than the classical direction outlined in MF12?

We will see that our new appreciation of the power of multisets, together with some insights from 20th century physicists, is just what we need to initiate a major paradigm shift in our thinking about arithmetic. Negative numbers, here we come!

https://www.youtube.com/watch?v=mDTsu_PNyIE