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We obtain results concerning the behaviour of the function 2 t t (a G On) under the assumption of the existence of certain kind of ideals. These results complement those of Ulam [7], Tarski [6] and(More)
We introduce a notion of weak intersection number of a collection of sets, modifying the notion of intersection number due to J.L. Kelley, and obtain an analogue of Kelley’s characterization of(More)