A wave-breaking criterion for the Constantin-Lannes equation is studied.Firstly,a priori estimates of the solution of the CL equation is given by using Young's inequality,Sobolev's inequality and the conservation of energy;then a blow-up result for the solution is obtained with the help of the Riccati-type inequality,and the result improves the main conclusions of the latest blow-up conditions for the CL equation.
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