Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Timelike and Spacelike Developable Ruled Surfaces   In this study, we have obtained the distribution parameter of a ruled surface
generated by a straight line in Frenet trihedron moving along a timelike curve
and also along another curve with the same parameter. At this time, the Frenet
frames of these timelike curves are not the same. We have moved the director
vector of the first curve along the second curve. It is shown that the ruled
surface is developable if and only if the base timelike curve is helix. In
addition, some smilarities and differences are presented with theorems and
results.

17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg