Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deflation and augmentation techniques in Krylov subspace methods for the
  solution of linear systems   In this paper we present deflation and augmentation techniques that have been
designed to accelerate the convergence of Krylov subspace methods for the
solution of linear systems of equations. We review numerical approaches both
for linear systems with a non-Hermitian coefficient matrix, mainly within the
Arnoldi framework, and for Hermitian positive definite problems with the
conjugate gradient method.

29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph