Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Differential Invariants and Construction of Conditionally Invariant
  Equations   New concept of conditional differential invariant is discussed that would
allow description of equations invariant with respect to an operator under a
certain condition. Example of conditional invariants of the projective operator
is presented.

37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph