In mathematics, the Moyal product (also called the star product or Weyl-Groenewold product) is perhaps the best-known example of a phase-space star product. It is an associative, non-commutative product, ★, on the functions on ℝ2n, equipped with its Poisson bracket (with a generalization to symplectic manifolds, described below).
== Historical comments ==
The Moyal product is named after José Enrique Moyal, but is also sometimes called the Weyl-Groenewold product as it was introduced by H. J. Groenewold in his 1946 doctoral dissertation, in a trenchant appreciation of the Weyl correspondence. Moyal...