• On inversely θ-semi-open and inversely θ-semi-closed functions 

      Sanabria, José; Rosas, Ennis; Vásquez, Luis (Matematychni Studii, 2020)
      In this paper, we introducethe concepts of inversely 6-semi-openandinversely 6-semi-closed functions andobtain their charactcrizationsif it is possible in terms of 6-closure and6-intcrior by using sets determined by thefibres ...