Suppose you have to use an element argument to prove the following statement. (Assume that all sets are subsets of a universal set U.) For all sets A, B, and C (A – B) n (C - B) C (AnC)- B. Consider the sentences in the following scrambled list. • Therefore a E (AnC)- B by the definition of set difference. • We must show that E (AnC)- B. • Thus x € An C by definition of intersection, and, in addition, a ¢ B. Thus, by definition of intersection, x € A and x E C, and, in addition, x B. By definition of intersection, те (А - В)П (С — B). • By definition of intersection, E A - B and x E C - B. Suppose A, B, and C are any sets and x E (AnC) - B. We must show that a E (A - B) n (C - B). Suppose A, B, and C are any sets and те (А - В)n(С - В). • By definition of set difference, r E A - B and x € C - B. • By definition of set difference, r E A and a ¢ B and a e C and a ¢ B. • By definition of intersection, r E A and a B and æ € C and e¢B.
Suppose you have to use an element argument to prove the following statement. (Assume that all sets are subsets of a universal set U.) For all sets A, B, and C (A – B) n (C - B) C (AnC)- B. Consider the sentences in the following scrambled list. • Therefore a E (AnC)- B by the definition of set difference. • We must show that E (AnC)- B. • Thus x € An C by definition of intersection, and, in addition, a ¢ B. Thus, by definition of intersection, x € A and x E C, and, in addition, x B. By definition of intersection, те (А - В)П (С — B). • By definition of intersection, E A - B and x E C - B. Suppose A, B, and C are any sets and x E (AnC) - B. We must show that a E (A - B) n (C - B). Suppose A, B, and C are any sets and те (А - В)n(С - В). • By definition of set difference, r E A - B and x € C - B. • By definition of set difference, r E A and a ¢ B and a e C and a ¢ B. • By definition of intersection, r E A and a B and æ € C and e¢B.
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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