Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Floer homology for 2-torsion instanton invariants   We construct a variant of Floer homology groups and prove a gluing formula
for a variant of Donaldson invariants. As a corollary, the variant of Donaldson
invariants is non-trivial for connected sums of 4-manifolds which satisfy a
condition for Donaldson invariants. We also show a non-existence result of
compact, spin 4-manifolds with boundary some homology 3-spheres and with
certain intersection forms.

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The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph