A kernel-decided non-normality certificate for the monomial ideal (x⁴,y⁵,z⁷) (Problem 41)
Cahen–Fontana–Frisch–Glaz Problem 41 (Swanson) asks to classify the triples (a,b,c) for which every power of I = integral closure of (x^a,y^b,z^c) is integrally closed (I normal). The full…