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It was conjectured several years ago \\cite{GGI, GI} and has been proved for many Fano manifols \\cite{CL1, CH2, LiMiSh, Ke}, including our cases, that the operator $[c_1(M)]$ has a real valued eigenvalue $\\delta_0$ which is maximal among eigenvaules of $[c_1(M)]$. 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It was conjectured several years ago \\cite{GGI, GI} and has been proved for many Fano manifols \\cite{CL1, CH2, LiMiSh, Ke}, including our cases, that the operator $[c_1(M)]$ has a real valued eigenvalue $\\delta_0$ which is maximal among eigenvaules of $[c_1(M)]$. 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