12. Suppose C is a class of subsets of 2 and suppose BC satisfies B e o(C). Show that there exists a countable class CR C C such that Be o(CB). Hint: Define G := {BC N:3 countable CB CC such that Beo (CB)}. Show that G is a o-field that contains C.
12. Suppose C is a class of subsets of 2 and suppose BC satisfies B e o(C). Show that there exists a countable class CR C C such that Be o(CB). Hint: Define G := {BC N:3 countable CB CC such that Beo (CB)}. Show that G is a o-field that contains C.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
![P( |Bn) = 1.
n=1
12. Suppose C is a class of subsets of 2 and suppose B C2 satisfies BE o (C).
Show that there exists a countable class CB C C such that B E O(CB).
Hint: Define
G := {BC N:3 countable CB CC such that Be o(CB)}.
Show that G is a o-field that contains C.
13 IE LD](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa9a9aa28-6f83-47e6-9d36-656f3dfebef7%2Fa41ec79b-87bf-473c-b58a-6d9d06ff9e3b%2F8vvo3v_processed.jpeg&w=3840&q=75)
Transcribed Image Text:P( |Bn) = 1.
n=1
12. Suppose C is a class of subsets of 2 and suppose B C2 satisfies BE o (C).
Show that there exists a countable class CB C C such that B E O(CB).
Hint: Define
G := {BC N:3 countable CB CC such that Be o(CB)}.
Show that G is a o-field that contains C.
13 IE LD
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