Question 239750
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A proper subset *[tex \Large S'] of a set *[tex \Large S], denoted *[tex \Large S'\ \subset\ S], is a subset that is strictly contained in *[tex \Large S] and so necessarily excludes at least one member of *[tex \Large S]. The empty set is therefore a proper subset of any nonempty set.



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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