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