Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A view on contractions of higher dimensional varieties   In this paper we discuss some recent results about extremal contractions of
complex algebraic varieties. These are proper surjective maps, $\phi:
X\longrightarrow Z$, of normal varieties with connected fibers such that $X$
has mild singularities (in particular $X$ is $Q$-Gorenstein) and the
anticanonical divisor of $X$ is $\phi$ ample. It will appear on the Proceedings
of AMS-SRI on Algebraic Geometry, Santa Cruz 1995.

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The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
4
The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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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: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg