Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lights Illuminate Surfaces Superluminally   When a light bulb is turned on, light moves away from it at speed $c$, by
definition. When light from this bulb illuminates a surface, however, this
illumination front is not constrained to move at speed $c$. A simple proof is
given that this illumination front always moves {\it faster} than $c$.
Generalized, when any compact light source itself varies, this information
spreads across all of the surfaces it illuminates at speeds faster than light.

9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
17
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: solv-int
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The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th