我们还有别的解呢，大概在这里,负根号，负的根在那里，而这里也是λ=2。

And we have the other solution 3 which is somewhere here. Negative root three, negative root there. And there, again, lambda equals two.

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文中也提出了利用分划曲线来判定系统特征方程具有全部负实部根的方法。

Methods of using the D-decomposition curves to judge whether all the roots of the characteristic equation possess a negative real part are also discussed.

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次一个重要的问题是怎样预知正根，负根和复根的个数。

The next significant question was how to predict the number of positive, negative and complex roots.

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But the mathematicians told Dirac, "You cannot ignore the negative energy solution because it tells you there's a second solution and you cannot throw them out."

但数学家们告诉狄拉克,你不能忽略负的能量,因为数学告诉我有两个根,你不能随便丢掉

耶鲁公开课 - 基础物理课程节选

So we don't have any trouble with negative times.

所以此处负根对我们不构成干扰

耶鲁公开课 - 基础物理课程节选

And it turns out the second solution, with negative energy, was when the theory is telling you, hey, there are particles and there are anti-particles, and the negative energy when properly interpreted will describe anti-particles.

结果,后来证明,第二个根,也就是能量为负的那个根,正是理论的关键,世界上既有粒子,也有反粒子,负能量就是用来解释反粒子的

耶鲁公开课 - 基础物理课程节选