The aim of this paper is to introduce the class of OFR-sets as the sets that are the intersection of an open set and a feeble-regular set. Several classes of matroids are studied via the new concept. New decompositions of strong maps are provided.
AL-HAWARY, TALAL ALİ (2001) "Characterizations of Matroid VIA OFR-Sets," Turkish Journal of Mathematics: Vol. 25: No. 3, Article 7. Available at: https://journals.tubitak.gov.tr/math/vol25/iss3/7