Consider the following recurrence relation. - {²(0-1) + 0² if n=0 (a) Compute the first eight values of P(n). (Enter your answers as a comma-separated list of values ordered with respect to increasing n.) 1,2,6,15,31,56,92,141,205 eBook P(n) = (b) Analyze the sequences of differences. (Enter your answers as first differences: 4,9,16,25,36,49,64 second differences: X third differences: 5.7.9.11.13.15 2,2,2,2,2 X What does this suggest about the closed form solution? X This suggests that the closed form will have degree 3 X (c) Find a good candidate for a closed-form solution. 1+ n(n+1) (2n+1) P(n) = 6 (d) Prove that your candidate solution is the correct closed-form solution. (Induction on n.) Let f(n) = comma-separated list of values ordered with respect to increasing n.) Base Case: If n = 0, the recurrence relation says that P(0) = 1, and the formula says that f(0) = Inductive Hypothesis: Suppose as inductive hypothesis that P(k-1) = Inductive Step: Using the recurrence relation, P(K) = P(k-1) + k², by the second part of the recurrence relation + k², by inductive hypothesis so, by induction, P(n) = f(n) for all n ≥ 0. for some k > 0. so they match.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Consider the following recurrence relation.
- {²(0-1) + 0² if n=0
(a) Compute the first eight values of P(n). (Enter your answers as a comma-separated list of values ordered with respect to increasing n.)
1,2,6,15,31,56,92,141,205
eBook
P(n) =
(b) Analyze the sequences of differences. (Enter your answers as
first differences:
4,9,16,25,36,49,64
second differences:
X
third differences:
5.7.9.11.13.15
2,2,2,2,2
X
What does this suggest about the closed form solution?
X
This suggests that the closed form will have degree 3
X
(c) Find a good candidate for a closed-form solution.
1+ n(n+1) (2n+1)
P(n) =
6
(d) Prove that your candidate solution is the correct closed-form solution.
(Induction on n.) Let f(n) =
comma-separated list of values ordered with respect to increasing n.)
Base Case: If n = 0, the recurrence relation says that P(0) = 1, and the formula says that f(0) =
Inductive Hypothesis: Suppose as inductive hypothesis that P(k-1) =
Inductive Step: Using the recurrence relation,
P(K) = P(k-1) + k², by the second part of the recurrence relation
+ k², by inductive hypothesis
so, by induction, P(n) = f(n) for all n ≥ 0.
for some k > 0.
so they match.
Transcribed Image Text:Consider the following recurrence relation. - {²(0-1) + 0² if n=0 (a) Compute the first eight values of P(n). (Enter your answers as a comma-separated list of values ordered with respect to increasing n.) 1,2,6,15,31,56,92,141,205 eBook P(n) = (b) Analyze the sequences of differences. (Enter your answers as first differences: 4,9,16,25,36,49,64 second differences: X third differences: 5.7.9.11.13.15 2,2,2,2,2 X What does this suggest about the closed form solution? X This suggests that the closed form will have degree 3 X (c) Find a good candidate for a closed-form solution. 1+ n(n+1) (2n+1) P(n) = 6 (d) Prove that your candidate solution is the correct closed-form solution. (Induction on n.) Let f(n) = comma-separated list of values ordered with respect to increasing n.) Base Case: If n = 0, the recurrence relation says that P(0) = 1, and the formula says that f(0) = Inductive Hypothesis: Suppose as inductive hypothesis that P(k-1) = Inductive Step: Using the recurrence relation, P(K) = P(k-1) + k², by the second part of the recurrence relation + k², by inductive hypothesis so, by induction, P(n) = f(n) for all n ≥ 0. for some k > 0. so they match.
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