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Special Grassmann manifolds \(V^ 4_ 3\) in the projective space \(P_ 7\). (English) Zbl 0651.53008
There are studied 4-parameter families of 3-dimensional projective subspaces of projective 7-space with special focal properties.
Reviewer: R.Walter
MSC:
53A20 Projective differential geometry
53A55 Differential invariants (local theory), geometric objects
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