Global Wellposedness of a Class of Weakly Hyperbolic Cauchy Problems with Variable Multiplicities on ${\mathbb{R}}^d$

Sandro Coriasco, Giovanni Girardi, N. Uday Kiran

We study a class of weakly hyperbolic Cauchy problems on ${\mathbb{R}}^d$, involving linear operators with characteristics of variable multiplicities, whose coefficients are unbounde…