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math-ph2009★ 6 cited
Geometry of Universal Magnification Invariants
M. C. Werner
Recent work in gravitational lensing and catastrophe theory has shown that the sum of the signed magnifications of images near folds, cusps and also higher catastrophes is zero. He…
math-ph2007★ 9 cited
A Lefschetz fixed point theorem in gravitational lensing
Marcus C. Werner
Topological invariants play an important rôle in the theory of gravitational lensing by constraining the image number. Furthermore, it is known that, for certain lens models, the i…