Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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7.
Suppose that X is a set, that I is a nonempty set, and that for each i Є I that Yi
is a set. Suppose that I is a nonempty set. Prove the following:2
(a) If Y; CX for all i EI, then Uiel Yi C X.
¹See Table 4.8.1 in zyBooks.
Recall:
Nie X₁ = Vi Є I (x = X₁) and x = Uier X₁ = i Є I (x Є Xi).
(b) If XCY; for all i Є I, then X Ciel Yi.
(c) U(x)=xnUY.
iЄI
ΕΙ
8.
For each of the following functions, determine whether or not it is (i) injective
and/or (ii) surjective. Justify why or why not.
(a) fiZZ defined by fi(n) = 2n.
(b) f2 RR defined by f2(x) = x² − 4x+7.
:
(c) f3 Z {0, 1} defined by f3(n) = 0 if n is even and f3(n) = 1 if n is odd.
(d) f4 Z N defined by f4(n) = 2n if n > 0 and f4(n) = -2n-1 if n < 0.
Chapter 15 Solutions
Advanced Engineering Mathematics
Ch. 15.1 - Prob. 1PCh. 15.1 - Prob. 2PCh. 15.1 - Prob. 3PCh. 15.1 - Prob. 4PCh. 15.1 - Prob. 5PCh. 15.1 - Prob. 6PCh. 15.1 - Prob. 7PCh. 15.1 - Prob. 8PCh. 15.1 - Prob. 9PCh. 15.1 - Prob. 10P
Ch. 15.1 - Prob. 12PCh. 15.1 - Prob. 13PCh. 15.1 - Prob. 14PCh. 15.1 - Prob. 15PCh. 15.1 - Prob. 16PCh. 15.1 - Prob. 17PCh. 15.1 - Prob. 18PCh. 15.1 - Prob. 19PCh. 15.1 - Prob. 20PCh. 15.1 - Prob. 21PCh. 15.1 - Prob. 22PCh. 15.1 - Prob. 23PCh. 15.1 - Prob. 24PCh. 15.1 - Prob. 25PCh. 15.1 - Prob. 26PCh. 15.1 - Prob. 27PCh. 15.1 - Prob. 29PCh. 15.1 - Prob. 30PCh. 15.2 - Prob. 1PCh. 15.2 - Prob. 2PCh. 15.2 - Prob. 3PCh. 15.2 - Prob. 4PCh. 15.2 - Prob. 5PCh. 15.2 - Prob. 6PCh. 15.2 - Prob. 7PCh. 15.2 - Prob. 8PCh. 15.2 - Prob. 9PCh. 15.2 - Prob. 10PCh. 15.2 - Prob. 11PCh. 15.2 - Prob. 12PCh. 15.2 - Prob. 13PCh. 15.2 - Prob. 14PCh. 15.2 - Prob. 15PCh. 15.2 - Prob. 16PCh. 15.2 - Prob. 17PCh. 15.2 - Prob. 18PCh. 15.3 - Prob. 1PCh. 15.3 - Prob. 2PCh. 15.3 - Prob. 3PCh. 15.3 - Prob. 4PCh. 15.3 - Prob. 5PCh. 15.3 - Prob. 6PCh. 15.3 - Prob. 7PCh. 15.3 - Prob. 8PCh. 15.3 - Prob. 9PCh. 15.3 - Prob. 10PCh. 15.3 - Prob. 11PCh. 15.3 - Prob. 12PCh. 15.3 - Prob. 13PCh. 15.3 - Prob. 14PCh. 15.3 - Prob. 15PCh. 15.3 - Prob. 16PCh. 15.3 - Prob. 17PCh. 15.3 - Prob. 18PCh. 15.3 - Prob. 19PCh. 15.4 - Prob. 1PCh. 15.4 - Prob. 2PCh. 15.4 - Prob. 3PCh. 15.4 - Prob. 4PCh. 15.4 - Prob. 5PCh. 15.4 - Prob. 6PCh. 15.4 - Prob. 7PCh. 15.4 - Prob. 8PCh. 15.4 - Prob. 9PCh. 15.4 - Prob. 10PCh. 15.4 - Prob. 11PCh. 15.4 - Prob. 12PCh. 15.4 - Prob. 13PCh. 15.4 - Prob. 14PCh. 15.4 - Prob. 16PCh. 15.4 - Prob. 18PCh. 15.4 - Prob. 19PCh. 15.4 - Prob. 20PCh. 15.4 - Prob. 21PCh. 15.4 - Prob. 22PCh. 15.4 - Prob. 23PCh. 15.4 - Prob. 24PCh. 15.4 - Prob. 25PCh. 15.5 - Prob. 2PCh. 15.5 - Prob. 3PCh. 15.5 - Prob. 4PCh. 15.5 - Prob. 5PCh. 15.5 - Prob. 6PCh. 15.5 - Prob. 7PCh. 15.5 - Prob. 8PCh. 15.5 - Prob. 9PCh. 15.5 - Prob. 10PCh. 15.5 - Prob. 11PCh. 15.5 - Prob. 12PCh. 15.5 - Prob. 13PCh. 15.5 - Prob. 14PCh. 15.5 - Prob. 15PCh. 15.5 - Prob. 16PCh. 15.5 - Prob. 17PCh. 15 - Prob. 1RQCh. 15 - Prob. 2RQCh. 15 - Prob. 3RQCh. 15 - Prob. 4RQCh. 15 - Prob. 5RQCh. 15 - Prob. 6RQCh. 15 - Prob. 7RQCh. 15 - Prob. 8RQCh. 15 - Prob. 9RQCh. 15 - Prob. 10RQCh. 15 - Prob. 11RQCh. 15 - Prob. 12RQCh. 15 - Prob. 13RQCh. 15 - Prob. 14RQCh. 15 - Prob. 15RQCh. 15 - Prob. 16RQCh. 15 - Prob. 17RQCh. 15 - Prob. 18RQCh. 15 - Prob. 19RQCh. 15 - Prob. 20RQCh. 15 - Prob. 21RQCh. 15 - Prob. 22RQCh. 15 - Prob. 23RQCh. 15 - Prob. 24RQCh. 15 - Prob. 25RQCh. 15 - Prob. 26RQCh. 15 - Prob. 27RQCh. 15 - Prob. 28RQCh. 15 - Prob. 29RQCh. 15 - Prob. 30RQ
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