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In mathematics, the spectral gap is the difference between the moduli of the two largest eigenvalues of a matrix or operator; alternately, it is sometimes taken as the smallest non-zero eigenvalue. Various theorems relate this difference to other properties of the system. See: * Expander graph (discrete case) * Poincaré inequality (continuous case) ==See also== * Spectral radius * Eigengap 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" 〔http://www.sciencedirect.com/science/article/pii/S0022123601937747〕 with gratitude finizadehgmailcom 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「spectral gap」の詳細全文を読む スポンサード リンク
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