Is the sequence { a n } a solution of the recurrence relation a n = 8 a n − 1 − 16 a n − 2 if a n = 0 ? a n = 1 ? a n = 2 n ? a n = 4 n ? a n = n 4 n ? a n = 2 ⋅ 4 n + 3 n 4 n ? a n = ( − 4 ) n ? a n = n 2 4 n ?
Is the sequence { a n } a solution of the recurrence relation a n = 8 a n − 1 − 16 a n − 2 if a n = 0 ? a n = 1 ? a n = 2 n ? a n = 4 n ? a n = n 4 n ? a n = 2 ⋅ 4 n + 3 n 4 n ? a n = ( − 4 ) n ? a n = n 2 4 n ?
Solution Summary: The author explains that the sequence lefta_nright is a solution or not of the recurrence relation.
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.
2.
Disprove the following by finding counterexamples:
3.
(a) For all sets A and B, AU (BNA) = B.
(b) For all sets A, B, and C, ANBCC if and only if ACC and B C C.
Suppose A and B are subsets of a universal set U. Using the set identities¹ prove
the following:
(a) (ANB) U(ANB) = B
(b) A (BA) = A
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