A sharp square function estimate for the cone in ℝ3

@article{Guth2019ASS,
  title={A sharp square function estimate for the cone in
 ℝ3},
  author={L. Guth and H. Wang and Ruixiang Zhang},
  journal={arXiv: Classical Analysis and ODEs},
  year={2019}
}
We prove a sharp square function estimate for the cone in $\mathbb{R}^3$ and consequently the local smoothing conjecture for the wave equation in $2+1$ dimensions. 
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