Extracting a \(\Sigma \)-Mal’tsev (\(\Sigma \)-Protomodular) Structure from a Mal’tsev (Protomodular) Subcategory Dominique Bourn OriginalPaper 17 May 2019 Pages: 619 - 640
Crossed Modules of Monoids I: Relative Categories Gabriella Böhm OriginalPaper Open access 10 August 2019 Pages: 641 - 662
Compact Hausdorff Spaces with Relations and Gleason Spaces G. BezhanishviliD. GabelaiaM. Jibladze OriginalPaper 13 August 2019 Pages: 663 - 686
Neighbourhood Operators: Additivity, Idempotency and Convergence A. Razafindrakoto OriginalPaper 11 October 2019 Pages: 703 - 721