Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orientability and real Seiberg-Witten invariants   We investigate Seiberg-Witten theory in the presence of real structures.
Certain conditions are obtained so that integer valued real Seiberg-Witten
invariants can be defined. In general we study properties of the real
Seiberg-Witten projection map from the point of view of Fredholm map degrees.

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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: physics
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The categories of this paper are: econ
30
The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: eess