Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: K-frames in Hilbert $C^*$-modules   In this paper, firstly we investigate conditions under which the action of an
operator on a $K$-frame, remain again a $K$-frame for Hilbert module E. We also
give a generalization of Douglas Theorem and we shall use it to prove the sum
of two $K$-frame under certain condition is again a $K$-frame. Finally, we
characterize the $K$-frame generators for a unitary system in terms of
operators.

9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat