Math 468

Problem set 1, due Friday, January 23

1. Is the set

2. If A1, A2, A3, ... are each countable, is their union?

3. What is the smallest closed subset of R which contains Q?

Questions or comments? Email me at John.H.Palmieri.2@nd.edu.

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John H. Palmieri, Department of Mathematics, University of Notre Dame, John.H.Palmieri.2@nd.edu