CPHT, Ecole Polytechnique, 91128 Palaiseau Cedex, France
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Received: 29 April 2015
Revised: 7 May 2015
Published online: 17 July 2015
All scientists who have dealt with gaseous states of matter know Jacques Yvon. They may have never read his full name but they all heard of the B-B-G-K-Y hierarchy where the last letter stands for Yvon. In a paper published in 1935, Jacques Yvon showed that, in a gas, the reduced p-particle distribution functions are linked by a chain of equations. This result was the first step towards the B-B-G-K-Y hierarchy. Then, he found that a correlation analysis provides an adequate truncation that allows solving the system. He applied these results to equilibrium states and demonstrated the efficiency of the method to relate thermodynamic quantities and microscopic properties.
© EDP Sciences, Springer-Verlag, 2015