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Gravitational lenses: odd or even images? (English) Zbl 0942.83009

MSC:
83B05 Observational and experimental questions in relativity and gravitational theory
58E05 Abstract critical point theory (Morse theory, Lyusternik-Shnirel’man theory, etc.) in infinite-dimensional spaces
83C10 Equations of motion in general relativity and gravitational theory
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