I have another question, if you don’t mind.

Do you know any simple argument to show that different orders of a monomial of operators (that is, different ways of multiplying n and m $B’s$) correspond to different polynomials, using the Weyl prescription? ]]>

I am trying to understand why the weyl ordering results in an associative product rule for formal series.

I followed your steps up until you combine equations 5,7,9. However, I don’t understand how you “compare coefficients”. In the left hand side of the equation you obtain after that (not numbered), you isolate the term corresponding to the product of the n’th and m’th power of each exponential.

How do you find, in the left hand side, the terms that correspond to this?

Thanks

]]>Yours sincere,

Han Daoyuan

Sent from my iPad

]]>