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4. Seymour Lipschutz, General Topology, (Schaum's Outline Series, McGraw Hill Book Company, 2004)
5. E. Kreyszig, Introduction to Functional Analysis with Applications, (John Wiley and Sons, 2006)
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7. G. Bachman and L. Narici, Functional Analysis, (Academic Press, 1966)
8. F. Riesz and B. Sz. Nagay, Functional Analysis, (Dover Publications, Inc., 1965)