[personal profile] epimorphisms_split
Пересечение сферы и плоскости — окружность.

Пересечение двух сфер — окружность.

Пересечение эллипсоида и плоскости — эллипс (кстати, почему?)

Будет ли пересечение двух эллипсоидов эллипсом? плоской кривой?

Кое-какие мои знакомые не могут ответить, хотя должны.
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epimorphisms_split

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