On Kato's ramification filtration

Subhadip Majumder

For a Henselian discrete valued field $K$ of characteristic $p>0$, Kato defined a ramification filtration $\{{\mathrm{fil}}_n{H}^q(K,{\mathbb{Q}}_p/{\mathbb{Z}}_p(q-1)){\}}_{n\ge 0}$ on $H^q(K,\…