Volume 4, No. 4 (2020)
Journal of Combinatorial Algebra

pp. 325–358 Keys and Demazure crystals for Kac–Moody algebrasNicolas JaconCédric Lecouvey
pp. 359–367 A new bound for smooth spline spacesHal SchenckMike StillmanBeihui Yuan
pp. 369–395 An explicit construction of the universal division ring of fractions ofAndrei Jaikin-Zapirain
pp. 397–446 Affine hyperplane arrangements and Jordan classesGiovanna CarnovaleFrancesco Esposito