关于Dirac方程Levinson定理的更强表述
On the Stronger Statement of Levinson's Theorem for the Dirac Equation
摘要：
最近，狄拉克方程的Levinson定理得到了更强的表述，其中$E=\pm M$处的相移极限分别与相同能量下径向函数的节点数有关.然而，在这封信中，我们表明，这种说法必须修改，因为狄拉克方程的相移的限制可能是负的。
英文摘要：
Recently a stronger statement of Levinson's theorem for the Dirac equation was presented, where the limits of the phase shifts at $E=\pm M$ are related to the numbers of nodes of radial functions at the same energies, respectively. However, in this letter we show that this statement has to be modified because the limits of the phase shifts may be negative for the Dirac equation.
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