Reply to Hagen & Sudarshan's Comment
Abstract
We show that the argument in Phys Rev Lett 70 (1993) 1360 is correct and consistent, and that Hagen & Sudarshan's solution has inconsistency leading to non-vanishing commutators of [P1, P2] and [Pj, H] even in physical states. This proves that many of HS's statements in their Comment are based merely on incorrect guess, but not on careful algebra.
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