Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on arXiv:1807.08572, "Coexistence of Diamagnetism and
  Vanishingly Small Electrical Resistance at Ambient Temperature and Pressure
  in Nanostructures"   A recent preprint arXiv:1807.08572 reported the observation of a transition
in Ag/Au nanoparticle composites near room temperature and at ambient pressure,
to a vanishingly small four-probe resistance, which was tentatively identified
as a percolating superconducting transition. In this brief comment, I point out
that a vanishing four-probe resistance may also emerge in non-superconducting
systems near conductance percolation threshold.

1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph