负定二次型 meaning in English

negative definite quadratic form

Considering enough the property of the equa - tion , we prove existence of absorbing set of the solution in h ~ ( 1 ) by the method of changeing the higher order nonlinear term as nonnegative guadratic form and prove existence of absorbing set of the solution in h ~ ( 2 ) by the method of linear combining of energy inequality and multiform classical inequality
我们充分考虑方程的特点，将高阶非线性项化为一非负定二次型使得解在h ~ 1中的吸收集的存在性得以证明。通过能量估计的巧妙组合以及多种形式的不等式进行精细的估计以获得h “的吸收集的存在性