Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wick Calculus   In quantum field theory, physicists routinely use "normal ordering" of
operators, which just amounts to shuffling all creation operators to the left.
Potentially confusing, then, is the occurrence in the literature of
normal-ordered functions, sometimes called "Wick transforms". We aim to
introduce the reader to some basic results and ideas around this theme, if not
the mathematical subtleties; our intended audience are instructors who want to
add something to their quantum field theory course, or researchers who are
interested but not specialists in mathematical physics. For rigorous proofs and
careful mathematical discussions we only give references.

7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat