Let A and B be subsets of some universal set U. From Proposition 5.10, we know that if ACB, then Bc C AC. Now prove the following proposition: For all sets A and B that are subsets of some universal set U, AC B if and only if BC CAC.
Let A and B be subsets of some universal set U. From Proposition 5.10, we know that if ACB, then Bc C AC. Now prove the following proposition: For all sets A and B that are subsets of some universal set U, AC B if and only if BC CAC.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:**Proposition 5.10.** _Let_ \( A \) _and_ \( B \) _be subsets of the universal set_ \( U \). _If_ \( A \subseteq B \), _then_ \( B^c \subseteq A^c \).
In this proposition, we are given two subsets \( A \) and \( B \) of a universal set \( U \). The statement asserts that if \( A \) is a subset of \( B \) (meaning every element of \( A \) is also an element of \( B \)), then the complement of \( B \) is a subset of the complement of \( A \).
Complements (\( B^c \) and \( A^c \)) refer to all elements in the universal set \( U \) that are not in sets \( B \) and \( A \) respectively.
This proposition is a fundamental concept in set theory, illustrating the relationship between subsets and their complements.

Transcribed Image Text:Let \( A \) and \( B \) be subsets of some universal set \( U \). From Proposition 5.10, we know that if \( A \subseteq B \), then \( B^c \subseteq A^c \). Now prove the following proposition:
For all sets \( A \) and \( B \) that are subsets of some universal set \( U \), \( A \subseteq B \) if and only if \( B^c \subseteq A^c \).
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