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We give a partially alternate proof of the reality of the spectrum of the imaginary cubic oscillator in quantum mechanics.
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D.T. Trinh, Remarks on P T PT -pseudo-norm in P T PT -symmetric quantum mechanics, J. Phys. A: Math. Gen. 38
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A. Mostafazadeh, A critique of P T PT -symmetric quantum mechanics, arXiv:quant-ph/0310164
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