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JOURNALS // Itogi Nauki i Tekhniki. Sovremennaya Matematika i ee Prilozheniya. Tematicheskie Obzory // Archive

Itogi Nauki i Tekhniki. Sovrem. Mat. Pril. Temat. Obz., 2020 Volume 180, Pages 9–16 (Mi into635)

On the structure of some complexes of $m$-dimensional planes of the projective space $P^n$ containing a finite number of torses

I. V. Bubyakin

North-Eastern Federal University named after M. K. Ammosov

Abstract: This paper is devoted to the differential geometry of $\rho$-dimensional complexes $C^\rho$ of $m$-dimensional planes in the projective space $P^n$ containing a finite number of torses. We find a necessary condition under which the complex $C^\rho$ contains a finite number of torses. We clarify the structure of $\rho$-dimensional complexes $C^\rho$ for which all torses belonging to the complex $C^\rho$ have one common characteristic $(m+1)$-dimensional plane that touches the torse along an $m$-dimensional generator. Such complexes are denoted by $C^\rho(1)$. Also, we determine the image of complexes $C^\rho(1)$ in the $(m+1)(n-m)$-dimensional algebraic variety $\Omega(m,n)$ of the space $P^N$, where $N=\binom{m+1}{n+1}-1$, which is the image of the manifold $G(m,n)$ of $m$-dimensional planes of the projective space $P^n$ under the Grassmann mappping.

Keywords: Grassmannian, complex of multidimensional planes, Segre manifold.

UDC: 514.755.5

MSC: 53B25, 53C15

DOI: 10.36535/0233-6723-2020-180-9-16



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