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We show that the recent reinterpretation of oxygen isotope effects in cupratesuperconductors by D. R. Harshman et al. is mathematically and physicallyincorrect violating the Anderson theorem and the Coulomb law.

Comment on "Isotope effect in high-Tc superconductors" (D. R. Harshman, J. D. Dow, and A. T. Fiory, Physical Review B v.77, 024523 (2008))