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math.CV2019★ 1 cited
Pulling back singularities of codimension one objects
Luis Giraldo, Roland Roeder
We prove that the preimage of a germ of a singular analytic hypersurface under a germ of a finite holomorphic map is again singul…
math.CV2012
Counting Zeros of Harmonic Rational Functions and Its Application to Gravitational Lensing
Pavel M. Bleher, Youkow Homma, Lyndon L. Ji +1
General Relativity gives that finitely many point masses between an observer and a light source create many images of the light source. Positions of these images are solutions of $…