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We find out a group of identities, named Wronskian identities of bilinear KP hierarchy here, as well as two useful properties of D-operator. This makes it possible to easily search for some new Wronskian solutions for PDE which owns bilinear form, and to simplify the process of the proof. As an application of this new method, we propose the first Wronskian condition for the BKP I equation and for...
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