Exactly Solvable Nonlinear Evolution Equations Expressed by Trilinear Form
Hirota’s method is one of the powerfull ways to obtain exact solutions of soliton equations. It also serves as a tool to understand the structure of solutions. In fact, it has been revealed that almost all soliton equations are reduced to bilinear forms, which are equivalent to the identities of determinants. The theory of τ function developed by Sato et al. strongly relies on this fact [2-5]. Then an interesting question is whether it is possible to extend the soliton equations from the point of view.
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