Regularity of $f\,dt$ at a point $(c,d)$ of $w^2=h(t)$ with $h(c)=0$: exactly when $fw$ is in the local ring

Initializing...

Regularity of $f\,dt$ at a point $(c,d)$ of $w^2=h(t)$ with $h(c)=0$: exactly when $fw$ is in the local ring · Prove2Me