====== Qxy ======

###
The xy component of $Q$ is defined as:
\begin{equation}
Q_{xy} = 3xy/r^2.
\end{equation}
The equivalent operator in Quanty is created by:
<code Quanty Example.Quanty>
OppQxy = NewOperator("Qxy", NF, IndexUp, IndexDn)
</code>
The operator could also be defined by:
<code Quanty Example.Quanty>
Akm={{2,-2,sqrt(1.5)*I},{2, 2,-sqrt(1.5)*I}}
OppQxy=NewOperator("CF",NF,indexup,indexdn,Akm)
</code>
###



===== Table of contents =====
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