(i, j)-contably subcompact

定義

• A bitopological space (X,τ_1,τ_2) is (i, j)-countably subcompact if there exists an i-open base B for (X,τ_1,τ_2) such that ∩_{n=1}^∞U_n is not empty set whenever {U_n}_{n=1}^∞\subset B is a countable (i,j)-regular open filter base?.

出典

• Dvalishvili, B. P.,Bitopological spaces: theory, relations with generalized algebraic structures,and applications,North-Holland Mathematics Studies, 199. Elsevier Science B.V., Amsterdam, 2005.