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Subclass (set theory)
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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Charles C.Pinter (2013). A Book of Set Theory. Dover Publications Inc. p. 240. ISBN 978-0486497082. <a href="978-0486497082" target="_blank">978-0486497082</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>