
EBK FUND.OF DIFF.EQUATIONS+BOUNDARY...
7th Edition
ISBN: 9780321977175
Author: Nagle
Publisher: PEARSON CO
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Chapter 11.6, Problem 31E
To determine
To show:
The expression
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Let n = 7, let p = 23 and let S be the set of least positive residues mod p of the first (p − 1)/2
multiple of n, i.e.
n mod p, 2n mod p, ...,
p-1
2
-n mod p.
Let T be the subset of S consisting of those residues which exceed p/2.
Find the set T, and hence compute the Legendre symbol (7|23).
23
32
how come?
The first 11 multiples of 7 reduced mod 23 are
7, 14, 21, 5, 12, 19, 3, 10, 17, 1, 8.
The set T is the subset of these residues exceeding
So T = {12, 14, 17, 19, 21}.
By Gauss' lemma (Apostol Theorem 9.6),
(7|23) = (−1)|T| = (−1)5 = −1.
Let n = 7, let p = 23 and let S be the set of least positive residues mod p of the first (p-1)/2
multiple of n, i.e.
n mod p, 2n mod p, ...,
2
p-1
-n mod p.
Let T be the subset of S consisting of those residues which exceed p/2.
Find the set T, and hence compute the Legendre symbol (7|23).
The first 11 multiples of 7 reduced mod 23 are
7, 14, 21, 5, 12, 19, 3, 10, 17, 1, 8.
23
The set T is the subset of these residues exceeding
2°
So T = {12, 14, 17, 19, 21}.
By Gauss' lemma (Apostol Theorem 9.6),
(7|23) = (−1)|T| = (−1)5 = −1.
how come?
Shading a Venn diagram with 3 sets: Unions, intersections, and...
The Venn diagram shows sets A, B, C, and the universal set U.
Shade (CUA)' n B on the Venn diagram.
U
Explanation
Check
A-
B
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Chapter 11 Solutions
EBK FUND.OF DIFF.EQUATIONS+BOUNDARY...
Ch. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - Prob. 3ECh. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - Prob. 7ECh. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - Prob. 9ECh. 11.2 - In Problems 1-12, determine the solutions, if any,...
Ch. 11.2 - Prob. 11ECh. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - Prob. 13ECh. 11.2 - In Problems 13-20, find all the real eigenvalues...Ch. 11.2 - In Problems 13-20, find all the real eigenvalues...Ch. 11.2 - Prob. 16ECh. 11.2 - In Problems 13-20, find all the real eigenvalues...Ch. 11.2 - In Problems 13-20, find all the real eigenvalues...Ch. 11.2 - In Problems 13-20, find all the real eigenvalues...Ch. 11.2 - In Problems 13-20, find all the real eigenvalues...Ch. 11.2 - In Problems 23-26, find all the real values of ...Ch. 11.2 - In Problems 23-26, find all the real values of ...Ch. 11.2 - In Problems 23-26, find all the real values of ...Ch. 11.2 - In Problems 23-26, find all the real values of ...Ch. 11.3 - In Problem 1-6, convert the given equation into...Ch. 11.3 - In Problem 1-6, convert the given equation into...Ch. 11.3 - Prob. 3ECh. 11.3 - In Problem 1-6, convert the given equation into...Ch. 11.3 - Prob. 5ECh. 11.3 - In Problems 1-6, convert the given equation into...Ch. 11.3 - Prob. 7ECh. 11.3 - In problem 7-11, determine whether the given...Ch. 11.3 - In problem 7-11, determine whether the given...Ch. 11.3 - Prob. 10ECh. 11.3 - Prob. 11ECh. 11.3 - Prob. 12ECh. 11.3 - Let be an eigenvalue and a corresponding...Ch. 11.3 - Prob. 15ECh. 11.3 - Show that if =u+iv is an eigenfunction...Ch. 11.3 - In Problems 17 -24, a determine the normalized...Ch. 11.3 - In Problems 17 -24, a determine the normalized...Ch. 11.3 - In Problems 17 -24, a determine the normalized...Ch. 11.3 - In Problems 17 -24, a determine the normalized...Ch. 11.3 - In Problems 17 -24, a determine the normalized...Ch. 11.3 - In Problems 17 -24, a determine the normalized...Ch. 11.3 - Prob. 25ECh. 11.3 - Prove that the linear differential operator...Ch. 11.4 - Prob. 1ECh. 11.4 - Prob. 2ECh. 11.4 - Prob. 3ECh. 11.4 - Prob. 4ECh. 11.4 - Prob. 5ECh. 11.4 - Prob. 6ECh. 11.4 - In Problems 7-10, find theadjointoperator and its...Ch. 11.4 - Prob. 8ECh. 11.4 - Prob. 9ECh. 11.4 - In Problems 7-10, find the adjoint operator and...Ch. 11.4 - Prob. 11ECh. 11.4 - Prob. 12ECh. 11.4 - Prob. 13ECh. 11.4 - Prob. 14ECh. 11.4 - Prob. 15ECh. 11.4 - Prob. 16ECh. 11.4 - Prob. 17ECh. 11.4 - Prob. 18ECh. 11.4 - Prob. 19ECh. 11.4 - Prob. 20ECh. 11.4 - Prob. 21ECh. 11.4 - Prob. 22ECh. 11.4 - Prob. 23ECh. 11.4 - Prob. 24ECh. 11.4 - Prob. 25ECh. 11.4 - Prob. 26ECh. 11.4 - Prob. 27ECh. 11.4 - Prob. 28ECh. 11.4 - Prob. 29ECh. 11.5 - Prob. 1ECh. 11.5 - In Problems 1-8, find a formal eigenfunction...Ch. 11.5 - Prob. 3ECh. 11.5 - In Problems 1-8, find a formal eigenfunction...Ch. 11.5 - Prob. 5ECh. 11.5 - Prob. 6ECh. 11.5 - Prob. 7ECh. 11.5 - Prob. 8ECh. 11.5 - In Problem 9-14, find a formal eigenfunction...Ch. 11.5 - In Problem 9-14, find a formal eigenfunction...Ch. 11.5 - Prob. 11ECh. 11.5 - Prob. 12ECh. 11.5 - In Problem 9-14, find a formal eigenfunction...Ch. 11.5 - Derive the solution to Problem 12 given in...Ch. 11.6 - Prob. 1ECh. 11.6 - Prob. 2ECh. 11.6 - Prob. 3ECh. 11.6 - Prob. 4ECh. 11.6 - Prob. 5ECh. 11.6 - In Problems 1-10, find the Greens function G(x,s)...Ch. 11.6 - Prob. 7ECh. 11.6 - Prob. 8ECh. 11.6 - Prob. 9ECh. 11.6 - Prob. 10ECh. 11.6 - In problems 11 -20, use Greens functions to solve...Ch. 11.6 - In problems 11 -20, use Greens functions to solve...Ch. 11.6 - In Problems 11-20, use Greens functions to solve...Ch. 11.6 - In Problems 11-20, use Greens functions to solve...Ch. 11.6 - In Problems 11-20, use Greens functions to solve...Ch. 11.6 - In Problems 11-20, use Greens functions to solve...Ch. 11.6 - In Problems 11-20, use Greens functions to solve...Ch. 11.6 - Derive a formula using a Greens function for the...Ch. 11.6 - Prob. 22ECh. 11.6 - Prob. 23ECh. 11.6 - Prob. 24ECh. 11.6 - Prob. 25ECh. 11.6 - Prob. 26ECh. 11.6 - Prob. 31ECh. 11.7 - Prob. 2ECh. 11.7 - Prob. 3ECh. 11.7 - Prob. 4ECh. 11.7 - Prob. 5ECh. 11.7 - Prob. 6ECh. 11.7 - Prob. 8ECh. 11.7 - Prob. 9ECh. 11.7 - Prob. 10ECh. 11.7 - Prob. 11ECh. 11.7 - Prob. 12ECh. 11.7 - Show that the only eigenfunctions of 23-24...Ch. 11.7 - a. Use formula 25 to show that Pn(x) is an odd...Ch. 11.7 - Prob. 16ECh. 11.8 - Prob. 1ECh. 11.8 - Prob. 2ECh. 11.8 - Prob. 3ECh. 11.8 - Can the function (x)=x4sin(1/x) be a solution on...Ch. 11.8 - Prob. 6ECh. 11.8 - Prob. 7ECh. 11.8 - Prob. 8ECh. 11.8 - Prob. 9ECh. 11.8 - Prob. 10ECh. 11.8 - Prob. 11ECh. 11.8 - In equation (10), assume Q(x)m2 on [a,b]. Prove...Ch. 11.8 - Prob. 13ECh. 11.8 - Show that if Q(x)m20 on [a,), then every solution...Ch. 11.RP - Find all the real eigen-values and eigen-functions...Ch. 11.RP - Prob. 2RPCh. 11.RP - a. Determine the eigenfunctions, which are...Ch. 11.RP - Prob. 4RPCh. 11.RP - Use the Fredholm alternative to determine...Ch. 11.RP - Find the formal eigenfunction expansion for the...Ch. 11.RP - Find the Greens function G(x,s) and use it to...Ch. 11.RP - Find a formal eigenfunction expansion for the...Ch. 11.RP - Let (x) be a nontrivial solution to...Ch. 11.RP - Use Corollary 5 in Section 11.8 to estimate the...
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