“…Recently, authors in [23] provide new analysis to derive L ∞ estimate rather than using Green function and Duhamel's principle. In addition, there are lots of references [2,4,5,6,8,18,19,22,24], where the low regularity solutions were studied for the cut-off type Boltzmann equation. We also refer to recent results [1,7,14,21], etc., which deal with low regularity solution of the kinetic equation whose collision operator has regularizing effect such as non-cutoff Boltzmann or Landau equation.…”