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astro-ph2002
Algebraic Properties of the Real Quintic Equation for a Binary Gravitational Lens
Hideki Asada, Taketoshi Kasai, Masumi Kasai
It has been recently shown that the lens equation for a binary gravitational lens, which is apparently a coupled system, can be reduced to a real fifth-order (quintic) algebraic eq…
astro-ph2002
Images for an Isothermal Ellipsoidal Gravitational Lens from a Single Real Algebraic Equation
Hideki Asada, Takashi Hamana, Masumi Kasai
We present explicit expressions for the lens equation for a cored isothermal ellipsoidal gravitational lens as a single real sixth-order algebraic equation in two approaches; 2-dim…