Hexasecond, pentaprima and pentasecond of planes
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Abstract
The content of this note is a direct consequence of the preceding one. It presents a theorem that makes it possible to construct a hexasecond from seven arbitrary points. Since a hexasecond is a positional figure and is correlatively transferred to all geometric systems, the construction of a hexasecond of planes from seven given ones is implied by itself. But if only six planes are given, then the extra-plane is always at our disposal as the seventh and is not counted, being unique in its kind.
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