This article is cited in
1 paper
Uniformity of vector bundles of finite rank on complete intersections of finite codimension in a linear ind-Grassmannian
S. M. Yermakova P. G. Demidov Yaroslavl State University, Sovetskaya str., 14, Yaroslavl, 150000, Russia
Abstract:
A linear projective ind-variety
$\mathbf X$ is called
$1$-connected if any two points on it can be connected
by a chain of lines
$l_1, l_2,...,l_k$ in
$\mathbf X$,
such that
$l_i$ intersects
$l_{i+1}$.
A linear projective ind-variety
$\mathbf X$ is called
$2$-connected if
any point of
$\mathbf X$ lies on a projective line in
$\mathbf X$ and for any two lines
$l$ and
$l'$ in
$\mathbf X$ there is a chain of lines
$l=l_1, l_2,...,l_k=l'$, such that any pair
$(l_i,l_{i+1})$ is contained in a projective plane
$\mathbb P^2$ in
$\mathbf X$.
In this work we study an ind-variety
${\mathbf X}$ that is a complete intersection in the linear ind-Grassmannian
$\mathbf{G}=\underrightarrow{\lim}G(k_m,n_m)$. By definition,
${\mathbf X}$
is an intersection of
${\mathbf{G}}$ with a finite number
of ind-hypersufaces $\mathbf{Y_i}=\underrightarrow{\lim}Y_{i,m}, {m\geq1}$, of fixed degrees
$d_i$,
$i=1,...,l$, in the space
$\mathbf{P}^{\infty}$, in which the ind-Grassmannian
$\mathbf{G}$ is embedded by Plücker.
One can deduce from work [17] that
$\mathbf X$ is
$1$-connected. Generalising this result
we prove that
$\mathbf X$ is
$2$-connected. We deduce from this property that any vector bundle
$\mathbf{E}$ of finite rank on
$\mathbf X$ is uniform, i. e. the restriction of
$\mathbf{E}$ to all projective lines
in
$\mathbf X$ has the same splitting type.
The motiavtion of this work is to extend theorems of Barth–Van de Ven–Tjurin–Sato type to
complete intersections of finite codimension in ind-Grassmannians.
UDC:
512.7 Received: 25.11.2014