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Set Theory - Miscellaneous, Quantitative Reasoning Video Lecture | Quantitative for GMAT

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FAQs on Set Theory - Miscellaneous, Quantitative Reasoning Video Lecture - Quantitative for GMAT

1. What is set theory?
Ans. Set theory is a branch of mathematical logic that deals with the study of collections of objects, called sets. It provides a foundation for understanding mathematical structures by defining concepts such as union, intersection, subset, and complement of sets.
2. How is set theory applied in mathematics?
Ans. Set theory is used as a fundamental tool in various branches of mathematics, such as algebra, analysis, and topology. It provides a framework for defining mathematical objects and operations, allowing mathematicians to rigorously study concepts like numbers, functions, and geometric shapes.
3. What are the basic operations in set theory?
Ans. The basic operations in set theory are union, intersection, and complement. The union of two sets A and B is the set containing all elements that are in either A or B. The intersection of sets A and B is the set of elements that are common to both A and B. The complement of a set A is the set of all elements that are not in A.
4. How do you determine if one set is a subset of another?
Ans. To determine if one set is a subset of another, we compare the elements of the two sets. A set A is considered a subset of another set B if every element in A is also an element of B. In other words, if every element of A is contained within B, then A is a subset of B.
5. What is the cardinality of a set?
Ans. The cardinality of a set is a measure of the "size" or number of elements in the set. It is denoted by the symbol |A|, where A is the set. For finite sets, the cardinality is simply the count of elements in the set. For example, if a set A has 5 elements, its cardinality is |A| = 5. For infinite sets, the cardinality can be more complex and is described using different sizes of infinity, such as countably infinite or uncountably infinite.
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