On asymptotic higher analogs of the magnetic helicity invariant in MHD [PDF]
Petr M. Akhmet'evA solution of a problem by V.I.Arnol'd about higher analog of the asymptotic Hopf invariant of divergence-free vector fields is presented. A higher invariant of magnetic fields, which is not expressed from the asymptotic linking numbers of magnetic lines is constructed and examples of an asymptotic invariants is constructed.View original: http://arxiv.org/abs/1105.5876
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