Принцип тот же, но еще включают режим конвекции, чтобы мясо обдувалось со всех сторон. The reason you don't simply call the zero vector a foundation vector is the fact that it will not definitely add anything at all to your formalism if you concentrate on "$0 + e_1 + e_2$" https://bihlmayermedia-bilder.com/1-advent/