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most citedA Gravitational Lens need not produce an Odd Number of Images

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math.GT2005

Fixed Point Indices and Manifolds with Collars

Chen-Farng Benjamin, Daniel Henry Gottlieb

This paper concerns a formula which relates the Lefschetz number L(f) for a map f:M --> M' to the fixed point index I(f) summed with the fixed point index of a derived map on part…