Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Critical Study of Efrati et al.'s Elastic Theory of Unconstrained
  non-Euclidean Plates   In our analysis, we show that Efrati et al.'s publication is inconsistent
with the mathematics of plate theory. However it is more consistent with the
mathematics of shell theory, but with an incorrect strain tensor. Thus, the
authors' numerical results imply that a thin object can be stretched
substantially with very little force, which is physically unrealistic and
mathematically disprovable. All the theoretical work of the authors, i.e.
nonlinear plate equations in curvilinear coordinates, can easily be rectified
with the inclusion of both a sufficiently differentiable diffeomorphism and a
set of external loadings, such as an external strain field.

34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex