books.google.com - This book provides students of mathematics with the minimum amount of knowledge in logic and set theory needed for a profitable continuation of their studies. There is a chapter on statement calculus, followed by eight chapters on set theory....https://books.google.com/books/about/Elementary_Set_Theory_Part_I_II.html?id=cdmy2eOhJdkC&q=proper+subset&utm_source=gb-gplus-shareElementary Set Theory, Part I/II

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