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Tang et al. [Science 361, 570 (2018)] report on the properties of Diracfermions with both on-site and Coulomb interactions. The substantial decreaseup to ~40% of the Fermi velocity of Dirac fermions with on-site interaction isinconsistent with the numerical data near the Gross-Neveu quantum criticalpoint. This results from an inappropriate finite-size extrapolation.

Comment on "The role of electron-electron interactions in two-dimensional Dirac fermions''