Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Basis Optimization Renormalization Group for Quantum Hamiltonian   We find an algorithm of numerical renormalization group for spin chain
models. The essence of this algorithm is orthogonal transformation of basis
states, which is useful for reducing the number of relevant basis states to
create effective Hamiltonian. We define two types of rotations and combine them
to create appropriate orthogonal transformation.

24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
2
The categories of this paper are: math