15. Sets
The chapter provides a comprehensive introduction to sets, including their definitions, representations, and various operations like union, intersection, and difference. It also discusses set identities and the power set concept, along with notable properties such as equality, subsets, and cardinality of sets.
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Sections
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What we have learnt
- A set is defined as an unordered collection of objects.
- The roster method and set builder form are two methods to express a set.
- The cardinality of a set is the count of its elements, distinguishing between finite and infinite sets.
Key Concepts
- -- Set
- An unordered collection of distinct objects.
- -- Union
- The union of two sets A and B is the set of elements that are in either A, B, or both.
- -- Intersection
- The intersection of two sets A and B consists of elements that are in both A and B.
- -- Power Set
- The power set of a set S is the set of all possible subsets of S, including the empty set and S itself.
- -- Cardinality
- The number of elements in a set, denoted by |S|.
- -- Subset
- A set A is a subset of set B if every element of A is also an element of B.
- -- Proper Subset
- A set A is a proper subset of set B if A is a subset of B and there exists at least one element in B that is not in A.
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