Schur’s lemma for exact categories implies abelian
Published in J. Algebra, October 2021. Links: journal, arXiv:2002.09241
Citation: H. Enomoto, Schur's lemma for exact categories implies abelian, J. Algebra 584 (2021), 260--269.
In this short paper, I generalize Ringel’s bijection between semibricks (sets of pairwise Hom-orthogonal bricks) and wide subcategories to exact categories. In particular, I proved the title.