作者：Guoyuan; CHENlm型光谱非自伴指数和案例流量椭圆算子定理证明
摘要：A version of the 'Fredholm index = spectral flow' theorem is proved for general families of elliptic operators {A(t)} t∈R on closed (compact and without boundary) manifolds. Here we do not require that A(t), t∈R or its leading part is self-adjoint.
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