Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Innovative Approach to Balancing Chemical-Reaction Equations: A
  Simplified Matrix-Inversion Technique for Determining The Matrix Null Space   I propose a novel approach to balancing equations that is applicable to all
chemical-reaction equations; it is readily accessible to students via
scientific calculators and basic computer spreadsheets that have a
matrix-inversion application. The new approach utilizes the familiar
matrix-inversion operation in an unfamiliar and innovative way; its purpose is
not to identify undetermined coefficients as usual, but, instead, to compute a
matrix null space (or matrix kernel). The null space then provides the
coefficients that balance the equation. Indeed, the null space contains
everything there is to know about balancing any chemical-reaction equation!

23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin