Liouville's theorem

noun
Liou·​ville's theorem | \(ˈ)lyü¦vēlz-\

Definition of Liouville's theorem 

: a theorem in fluid dynamics: the density of any selected part of a stream of fluid that does no work and that has no work done on it remains constant as that part moves along its stream line

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History and Etymology for Liouville's theorem

after Joseph Liouville †1882 French mathematician

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