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The Cauchy problem of the 2D Zakharov–Kuznetsov equation∂  t   ⁡  u   +∂  x   ⁡   (    ∂   x  ⁢  x    +   ∂   y  ⁢  y)    ⁡  u   +   u  ⁢   u  x=  0{\partial_{t}u+\partial_{x}(\partial_{xx}+\partial_{yy})u+uu_{x}=0}    is considered. It is shown that the 2D Z-K equation is locally well-posed in the endpoint Sobolev spaceH   -   1  /  4{H^{-1/4}}   , and it is globally well-posed inH   -   1  /  4{H^{-1/4}}    with small initial data. In this paper, we mainly establish some new dyadic bilinear estimates to obtain the results, where the main novelty is to parametrize the singularity of the resonance function in terms of a univariate polynomial.

Dyadic bilinear estimates and applications to the well-posedness for the 2D Zakharov–Kuznetsov equation in the endpoint space 𝐻 −1/4