Article Preprints For This Issue Corrigendum to “The Hasse norm principle for abelian extensions [Amer. J. Math. 140 (2018), NO. 6, 1639-1685]”By C. Frei, D. Loughran, and R. Newton The magnitude and spectral geometryBy H. Gimperlein, M. Goffeng, and N. Louca Bessel models for unitary groups and Schwartz homologyBy H. Xue Global shifted potentials for moduli stacks of sheaves on Calabi-Yau four-foldsBy D. Borisov, L. Katzarkov, A. Sheshmani, and S.-T. Yau Pants complex, TQFT and hyperbolic geometryBy R. Detcherry and E. Kalfagianni A Calabi operator for Riemannian locally symmetric spacesBy F. Constanza, M. Eastwood, T. Leistner, and B. McMillan Rigidity of Lipschitz map using harmonic map heat flowBy M.-C. Lee and L.-F. Tam Unknotting number and cablingBy J. Hom, T. Lidman, and J. Park On restricted projections to planes in R^3By S. Gan, S. Guo, L. Guth., T. L. J. Harris, D. Maldague, and H. Wang Metric limits of manifolds with positive scalar curvatureBy M.-C. Lee and P. Topping