Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Birth and life of the $L^{2}$ boundedness of the Cauchy Integral on
  Lipschitz graphs   We review various motives for considering the problem of estimating the
Cauchy Singular Integral on Lipschitz graphs in the $L^{2}$ norm. We follow the
thread that led to the solution and then describe a few of the innumerable
applications and ramifications of this fundamental result. We concentrate on
its influence in complex analysis, geometric measure theory and harmonic
measure.

28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th