Consider the following theorem.
Theorem: For all sets A and B, if A ⊆ B, then A ∪ B ⊆ B.
Su...
Mathematics, 01.05.2021 18:30 Brucechavez3334
Consider the following theorem.
Theorem: For all sets A and B, if A ⊆ B, then A ∪ B ⊆ B.
Supply explanations for the steps in the proof of the theorem.
Proof:
Statement Explanation
Suppose A, B, and C are any sets such that A ⊆ B. starting point
We must show that A ∪ B ⊆ B. conclusion to be shown
Let x be any element in A ∪ B. start of an element proof
Then x is in A or x is in B. ---Select---
In case x is in A, then x is in B ---Select---
In case x is in B, then x is in B. tautology (p → p)
So in either case, x is in B. proof by division into cases
Thus every element in A ∪ B is in B. since x could be any element
of A ∪ B
Therefore, A ∪ B ⊆ B [as was to be shown]. ---Select---
Answers: 3
Mathematics, 21.06.2019 22:40
Adeli owner keeps track of the to-go orders each day. the results from last saturday are shown in the given two-way frequency table. saturday's to-go deli orders in person by phone online total pick up 38 25 31 94 delivery 35 28 34 97 total 73 53 65 191 what percent of the to-go orders were delivery orders placed by phone? a. 14.66% b. 38.41% c. 28.87% d. 52.83%
Answers: 2
Mathematics, 22.06.2019 00:30
Find the length of the radius of a circle with the center at -7+2i and a point in the circle at 33+11i
Answers: 1
Biology, 03.07.2019 17:00
Mathematics, 03.07.2019 17:00
Biology, 03.07.2019 17:00
Mathematics, 03.07.2019 17:00
Mathematics, 03.07.2019 17:00
Mathematics, 03.07.2019 17:00
Mathematics, 03.07.2019 17:00
Biology, 03.07.2019 17:00
Social Studies, 03.07.2019 17:00
History, 03.07.2019 17:00
History, 03.07.2019 17:00
History, 03.07.2019 17:00
History, 03.07.2019 17:00
Social Studies, 03.07.2019 17:00