This text is appropriate for a course that introduces undergraduates to proofs. The material includes elementary symbolic logic, logical arguments, basic set theory, functions and relations, the real number system, and an introduction to cardinality. The text is intended to be readable for sophomore and better freshmen majoring in mathematics.
The source files for the text can be found at https://github.com/RPMillspaugh/SetTheory
Grand Forks, ND
Mathematics, elementary set theory
Mathematics | Set Theory
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Millspaugh, Richard P., "Elementary Set Theory" (2018). Open Educational Resources. 7.