Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Spherically symmetric perfect fluid in area-radial
  coordinates" by Iguchi et al   In this short note we comment about some criticisms - appeared in a recent
paper by Iguchi et al - to our previous works on gravitational collapse of
perfect fluids. We show that those criticisms are incorrect on their own.

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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
2
The categories of this paper are: math
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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol