Reconstruction of a hypersurface singularity from its moduli algebra

In this paper we present a constructive method to characterize ideals of the local ring \({\mathscr {O}}_{{\mathbb {C}}^n,0}\) of germs of holomorphic functions at \(0\in {\mathbb {C}}^n\) which arise as the moduli ideal \(\langle f,{\mathfrak {m}}\, j(f)\rangle \), for some \(f\in {\mathfrak {m}}\subset {\mathscr {O}}_{{\mathbb {C}}^n,0}\). A consequence of our characterization is an effective solution to a problem dating back to the 1980s, called the Reconstruction Problem of the hypersurface singularity from its moduli algebra. Our results work regardless of whether the hypersurface singularity is isolated or not.