Birkhoff strata of the Grassmannian Gr$\mathrm{^{(2)}}$: Algebraic curves

Details Birkhoff strata of the Grassmannian Gr$\mathrm{^{(2)}}$: Algebraic curves Birkhoff strata of the Grassmannian Gr$\mathrm{^{(2)}}$: Algebraic curves

2010-11-18

arxiv.org/abs/1011.4205v2

Physics

Mathematical Physics

14 pages, no figures, improved some definitions, typos corrected

Scientific paper

Algebraic varieties and curves arising in Birkhoff strata of the Sato Grassmannian Gr${^{(2)}}$ are studied. It is shown that the big cell $\Sigma_0$ contains the tower of families of the normal rational curves of all odd orders. Strata $\Sigma_{2n}$, $n=1,2,3,...$ contain hyperelliptic curves of genus $n$ and their coordinate rings. Strata $\Sigma_{2n+1}$, $n=0,1,2,3,...$ contain $(2m+1,2m+3)-$plane curves for $n=2m,2m-1$ $(m \geq 2)$ and $(3,4)$ and $(3,5)$ curves in $\Sigma_3$, $\Sigma_5$ respectively. Curves in the strata $\Sigma_{2n+1}$ have zero genus.

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