Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nontrivial linear projections of the Grassmannian Gr_3(C^6)   A typical linear projection of the Grassmannian in its Plucker embedding is
injective, unless its image is a projective space. A notable exception are
self-adjoint linear projections, which have even degree. We consider linear
projections of Gr_3(C^6) with low-dimensional centers of projection. When the
center has dimension less than five, we show that the projection has degree 1.
When the center has dimension five and the projection has degree greater than
1, we show that it is self-adjoint.

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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol