TY - GEN AU - Madrid Labrador, Nicolás Miguel AU - Medina Moreno, Jesús AU - Ramírez Poussa, Eloísa A4 - Matemáticas PY - 2020 SN - 1641-876X SN - 2083-8492 (internet) UR - http://hdl.handle.net/10498/23485 AB - Rough set theory is an important tool to extract knowledge from relational databases. The original definitions of approximation operators are based on an indiscernibility relation, which is an equivalence one. Lately. different papers have motivated... LA - eng PB - UNIV ZIELONA GORA PRESS KW - rough sets KW - Galois connections KW - approximation operators TI - Rough sets based on Galois connections DO - 10.34768/amcs-2020-0023 ER -