Let  Vi =    x  ℝ    −  1 i  ≤ x ≤  1 i    =    −  1 i ,  1 i    for each positive integer i. Find each of the following. (Enter your answers using interval notation.)   (a) ∪4i = 1Vi =    (b) ∩4i = 1Vi =     (c) Are V1, V2, V3, mutually disjoint? Explain. a.) Yes, because the intersection of the sets V1, V2, V3, ... is empty. b.) Yes, because no two of the sets V1, V2, V3, ... have any elements in common.     c.) Yes, because the union of the sets V1, V2, V3, ... is empty. d.) No, because no two of the sets V1, V2, V3, ... are disjoint. e.) No, because the sets V1, V2, V3, ... are disjoint.   (d) ∪ni = 1Vi =    (e) ∩ni = 1Vi =    (f) ∪∞i = 1Vi =    (g) ∩∞i = 1Vi =

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter1: Fundamental Concepts Of Algebra
Section1.1: Real Numbers
Problem 23E
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Let 
Vi = 
 
x  ℝ 
 
− 
1
i
 ≤ x ≤ 
1
i
 
 = 
 
− 
1
i
1
i
 
 for each positive integer i. Find each of the following. (Enter your answers using interval notation.)
 
(a)
4i = 1Vi
 
(b)
4i = 1Vi = 
 
 (c) Are V1, V2, V3, mutually disjoint? Explain.
a.) Yes, because the intersection of the sets V1V2V3, ... is empty.
b.) Yes, because no two of the sets V1V2V3, ... have any elements in common.    
c.) Yes, because the union of the sets V1V2V3, ... is empty.
d.) No, because no two of the sets V1V2V3, ... are disjoint.
e.) No, because the sets V1V2V3, ... are disjoint.
 
(d)
ni = 1Vi = 
 
(e)
ni = 1Vi
 
(f)
i = 1Vi = 
 
(g)
i = 1Vi = 
 
 
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