学术报告（范大山 2026.3.10）

摘要： Recently，Cao, Liu, Si and Yan study a maximal operator based on a logarithm function. We combine this operator with Stein's spherical averaging, which can be viewed as the Stein's maximal spherical operator with a logarithmic perturbation.For the operator, we obtain some sharp boundedness results on Lebesgue spaces and on Hardy spaces.