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...ell’s equations]] of [[electromagnetism|electro­magnetism]]. These [[differential equation]]s must be solved [[simultaneous equation|simultaneously]], either === Ideal MHD equations ===

...ast2 = Lions | first2 = P.-L. | title= On the Cauchy problem for Boltzmann equations: global existence and weak stability | journal= Ann. of Math. |series= 2 | ...is [[Parametric equation|parameterized]] by time ''t''. The small volume ("differential [[volume element]]") is written