同义词
1)negative semidefinite quadratic form,半负定二次形式2)negative definite quadratic form,负定二次形式3)semidefinite quadratic form,半定二次形式4)negative semidefinite form,半负定形式5)negative semidefinite quadratic form,半负定二次型6)negative semi-definite quadratic form,负半定二次型
