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Hi
A much better definition was written on the introduction of the paper "An Estimate of the Gap of Spectrum of Schro� dinger Operators which Generate Hyperbounded Semigroups" By "Shigeki Aida"
with gratitude
Hfinizadeh{at}gmail.com
— Preceding unsigned comment added by 2.176.201.137 (talk) 10:23, 13 November 2015 (UTC)