Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Where the mathematical structure of Quantum Mechanics coms from   The mathematical formulation of Quantum Mechanics is derived from purely
operational axioms based on a general definition of "experiment" as a set of
transformations. The main ingredient of the mathematical construction is the
postulated existence of "faithful states" that allows one to calibrate the
experimental apparatus. Such notion is at the basis of the operational
definitions of the scalar product and of the "adjoint" of a transformation.

37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs