Today's reading was more challenging than usual because of the "tricks" involved in the derivations as well as the usage of fluid equations.  It appears that if I want to fully understand the rest of the Galactic Dynamics text, I will have to review and learn more fluid dynamics.  I've been wanting to learn more fluid dynamics theory and now I have a reason.  Every good physicist should know fluid dynamics.

I went through the derivation of Jeans equations, the velocity dispersion tensor, and the tensor form of the Virial theorem for collisionless systems.  I now have a much better understanding of why velocity dispersion is a useful thing to measure.

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