Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discrete differential geometry of triangle tiles and algebra of closed
  trajectories   This paper proposes a new mathematical framework that can be applied to
biological problems such as analysis of the structures of proteins and protein
complexes. In particular, it gives a new method for encoding the
three-dimensional structure of a protein into a binary sequence, where proteins
are approximated by a folded tetrahedron sequence. It also gives a new
algebraic framework for describing molecular complexes and their interactions.
  For simplicity, we shall explain the framework in the case of two-dimensional
objects. Then, the binary code of a plane curve is obtained as the ``second
derivative'' of the curve and ``fusion and fission'' of closed trajectories is
described algebraically.

13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
18
The categories of this paper are: econ
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th