Engineering↗
Modular Equations and the j-Invariant
Modular functions, modular equations relating j-invariants of isogenous curves, and their use in locating isogenies.
Every page in the KEVOS library tagged modular equation. 2 pages.
Modular functions, modular equations relating j-invariants of isogenous curves, and their use in locating isogenies.
Reducing a general quadratic congruence to a square root extraction, and handling the degenerate cases the reduction assumes away.