TY - GEN AU - El Kaoutit Zerri, Laiachi AU - Spinosa, Leonardo PY - 2019 UR - https://hdl.handle.net/10481/98618 AB - We explore the category of internal categories in the usual category of (right) group-sets, whose objects are referred to as categorified group-sets. More precisely, we develop a new Burnside theory, where the equivalence relation between two... LA - eng PB - Turkish Journal of Mathematics TI - Categorified groupoid-sets and their Burnside ring DO - 10.3906/mat-1811-63 ER -