Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On collapse of wave maps   We derive the universal collapse law of degree 1 equivariant wave maps
(solutions of the sigma-model) from the 2+1 Minkowski space-time,to the
2-sphere. To this end we introduce a nonlinear transformation from original
variables to blowup ones. Our formal derivations are confirmed by numerical
simulations.

12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th