## Abstract

In this chapter we shall study the basic properties of the Boltzmann equation. It is clear from Eq. (7.22) of Chapter I that the left-hand side and the right-hand side are completely different in nature, both from a mathematical and a physical standpoint. The left-hand side contains a linear differential operator which acts on the space- and time-dependence of *f*; if we equate this side to zero, we obtain an equation for the time evolution in absence of collisions, and the differential operator is accordingly called the “free-streaming operator.”

### Keywords

Entropy Convection aNol## Preview

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### References

### The content of this chapter is generally standard. References 6–10 of Chapter I can be consulted as general references. Section 1—For a mathematical proof that Eq. (1.18) gives all the solutions of Eq. (1.17) see ref 8 of Chapter I. Section 4—Maxwell’s discussion about boundary conditions can be found in:

- 1.J. C. Maxwell,
*Phil. Trans. Royal Soc.*I, Appendix (1879) ; reprinted in :*The Scientific Papers of J. C. Maxwell*, Dover Publications (1965).Google Scholar

### Section 5—For the dispute on the H-theorem see the papers by Boltzmann, Zermelo, and Poincaré in the collection

- 2.S. G. Brush (ed.),
*Kinetic Theory*, Vol. II, Pergamon Press, New York and London (1966).*For a modern proof of Poincaré’s theorem see*3. M. Kac,*Probability and Related Topics in Physical Sciences*, Interscience Publishers, New York (1959).Google Scholar

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© Springer Science+Business Media New York 1969