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Ryleigh Adams
Mathematics
21 September, 23:15
What is the cardinality of the set {ø, {ø}}?
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Joaquin Herman
21 September, 23:38
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a) ø 0
b) {ø} 1
c) {ø,{ø}} 2
d) {ø,{ø}, {ø,{ø}}} 3
#3. a) Section 1.6, page 85, #16: Can you conclude that A = B if A and B are 2 sets with the same power set? Why or why not?
The union of all the sets in the power set of X is X, so we can recover a set from its power set. The answer is "yes"
b) Section 1.6, page 86, #22: Suppose that A x B = ø, where A and B are sets. What can you conclude?
One of A or B (or both) must be empty (if neither A nor B were empty, there would be an element in AxB)
#4. a) Section 1.7, page 95, #14a, e: Let A, B and C be sets. Show that
a) (A U B) (A U B U C)
(i) in words by showing the appropriate subset relations as done in class
Suppose x A U B
Then x A or B
Therefore x A U B U C
(truthfully, this is almost given to be true by the definition of union)
b) (B - A) U (C - A) = (B U C) - A
We need to show:
1. (B - A) U (C - A) Í (B U C) - A
and 2. (B U C) - A Í (B - A) U (C - A)
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