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Central invariants revisited. (arXiv:1611.09134v2 [math.DG] UPDATED)
来源于:arXiv
We use refined spectral sequence arguments to calculate known and previously
unknown bi-Hamiltonian cohomology groups, which govern the deformation theory
of semi-simple bi-Hamiltonian pencils of hydrodynamic type with one independent
and \( N\) dependent variables. In particular, we rederive the result of
Dubrovin-Liu-Zhang that these deformations are parametrized by the so-called
central invariants, which are \( N\) smooth functions of one variable. 查看全文>>