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Quandaries & Queries
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 Topic: set theory
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5 items are filed under this topic.

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 A question about the empty set 2018-06-17 From Andrey:Hello there! I got that an empty set is a subset of every set. There is a question. Is an empty set an element of every set? ∅ ⊆ {x}True ∅ ∈{x}? Sorry if the question is easy. A set theory is a bit confusing.Answered by Penny Nom. A union and interception problem 2013-10-19 From Zakir:Sir, I have some problem in union there is a Question in a book find B set if A={2,4,6,8} , AUB={2,4,5,6,7,8} and A intersection B={6,8} plz tell me how can I find the B setAnswered by Penny Nom. Prove A intersect B =X iff A = X and B = X 2010-03-06 From Gloria:how would you prove A intersect B =X iff A = X and B = XAnswered by Tyler Wood. More on infinity and Set Theory 2009-02-17 From Justin:I greatly appreciate your help I was just wondering from your previous answer, why doesn't Cantor's cardinal numbers in set theory apply to the limit x->0, y=infinity? JustinAnswered by Robert Dawson. Infinity and Set Theory 2009-02-17 From Justin:I was just wondering is the limit x->0, y=1/x=infinity, the biggest uncountable infinity according to Cantor's cardinal numbers in set theory? JustinAnswered by Robert Dawson.

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