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¡ü2017/6/13(Tue)¡ü

16:30--18:00 ¿ô³Ø¶µ¼¼ Âç¥»¥ß¥Ê¡¼¼¼ (E404)

Jian Wang

Fujian Normal University¡¦µþÅÔÂç³Ø

Littlewood--Paley--Stein Estimates for Non-local Dirichlet Forms

In this talk, we present recent results about the boundedness in $L^p$ spaces for all $1<p<\infty$ of the so-called vertical Littlewood--Paley functions for non-local Dirichlet forms in the metric measure space. For $1<p\le 2$, the pseudo-gradient is used to overcome the difficulty that chain rules are not valid for non-local operators, and the Mosco convergence paves the way from finite jumping kernel case to general case, while for $2\le p<\infty$, the Burkholder--Gundy inequality is effectively applied. The former method is analytic and the latter one is probabilistic. The results extend those ones for pure jump symmetric L\'evy processes in Euclidean spaces.