Discrete Mathematics
5th Edition
ISBN: 9780134689562
Author: Dossey, John A.
Publisher: Pearson,
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Chapter A.3, Problem 15E
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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 A Solutions
Discrete Mathematics
Ch. A.1 - Prob. 1ECh. A.1 - Prob. 2ECh. A.1 - Prob. 3ECh. A.1 - Prob. 4ECh. A.1 - Prob. 5ECh. A.1 - Prob. 6ECh. A.1 - Prob. 7ECh. A.1 - Prob. 8ECh. A.1 - Prob. 9ECh. A.1 - Prob. 10E
Ch. A.1 - Prob. 11ECh. A.1 - Prob. 12ECh. A.1 - Prob. 13ECh. A.1 - Prob. 14ECh. A.1 - Prob. 15ECh. A.1 - Prob. 16ECh. A.1 - Write the negations of the statements in Exercises...Ch. A.1 - Prob. 18ECh. A.1 - Prob. 19ECh. A.1 - Prob. 20ECh. A.1 - Prob. 21ECh. A.1 - Prob. 22ECh. A.1 - Prob. 23ECh. A.1 - Prob. 24ECh. A.1 - Prob. 25ECh. A.1 - Prob. 26ECh. A.1 - Prob. 27ECh. A.1 - Prob. 28ECh. A.1 - Prob. 29ECh. A.1 - Prob. 30ECh. A.1 - Prob. 31ECh. A.1 - Prob. 32ECh. A.1 - Prob. 33ECh. A.1 - Prob. 34ECh. A.1 - Prob. 35ECh. A.1 - Prob. 36ECh. A.2 - Prob. 1ECh. A.2 - In Exercises 1–10, construct a truth table for...Ch. A.2 - In Exercises 1–10, construct a truth table for...Ch. A.2 - Prob. 4ECh. A.2 - Prob. 5ECh. A.2 - Prob. 6ECh. A.2 - Prob. 7ECh. A.2 - Prob. 8ECh. A.2 - Prob. 9ECh. A.2 - Prob. 10ECh. A.2 - Prob. 11ECh. A.2 - Prob. 12ECh. A.2 - Prob. 13ECh. A.2 - Prob. 14ECh. A.2 - Prob. 15ECh. A.2 - Prob. 16ECh. A.2 - Prob. 17ECh. A.2 - Prob. 18ECh. A.2 - Prob. 19ECh. A.2 - Prob. 20ECh. A.2 - Prob. 21ECh. A.2 - Prob. 22ECh. A.2 - Prob. 23ECh. A.2 - Prob. 24ECh. A.2 - Prob. 25ECh. A.2 - Prob. 26ECh. A.2 - Prob. 27ECh. A.2 - Prob. 28ECh. A.2 - Prob. 29ECh. A.2 - The statement [(p → q) ∧ ~q] → ~p is called modus...Ch. A.2 - Prob. 31ECh. A.2 - Prob. 32ECh. A.2 - Prob. 33ECh. A.2 - Prob. 34ECh. A.3 - Prove that ~(p ∧ ~q) is logically equivalent to p...Ch. A.3 - Prove that the law of syllogism is a tautology.
Ch. A.3 - Prove that if m is an integer and m2 is odd, then...Ch. A.3 - Prove, as in Example A.14, that there is no...Ch. A.3 - Prove the theorems in Exercises 5–12. Assume that...Ch. A.3 - Prove the theorems in Exercises 5–12. Assume that...Ch. A.3 - Prove the theorems in Exercises 5–12. Assume that...Ch. A.3 - Prove the theorems in Exercises 5–12. Assume that...Ch. A.3 - Prove the theorems in Exercises 5-12. Assume that...Ch. A.3 - Prove the theorems in Exercises 5–12. Assume that...Ch. A.3 - Prove the theorems in Exercises 5-12. Assume that...Ch. A.3 - Prove the theorems in Exercises 5-12. Assume that...Ch. A.3 - Prove or disprove the results in Exercises 13–22....Ch. A.3 - Prove or disprove the results in Exercises 13–22....Ch. A.3 - Prove or disprove the results in Exercises 13–22....Ch. A.3 - Prove or disprove the results in Exercises 13–22....Ch. A.3 - Prove or disprove the results in Exercises 13–22....Ch. A.3 - Prove or disprove the results in Exercises 13-22....Ch. A.3 - Prove or disprove the results in Exercises 13–22....Ch. A.3 - Prove or disprove the results in Exercises 13-22....Ch. A.3 - Prob. 21ECh. A.3 - Prob. 22ECh. A.3 - Prob. 23ECh. A.3 - Prob. 24ECh. A.3 - Prob. 25ECh. A.3 - Prob. 26ECh. A.3 - Prob. 27ECh. A.3 - Prob. 28ECh. A - Prob. 1SECh. A - Prob. 2SECh. A - Prob. 3SECh. A - Prob. 4SECh. A - Prob. 5SECh. A - Prob. 6SECh. A - Prob. 7SECh. A - Prob. 8SECh. A - Prob. 9SECh. A - Prob. 10SECh. A - Prob. 11SECh. A - Prob. 12SECh. A - Prob. 13SECh. A - Prob. 14SECh. A - Prob. 15SECh. A - Prob. 16SECh. A - Prob. 17SECh. A - Prob. 18SECh. A - Prob. 19SECh. A - Prob. 20SECh. A - Prob. 21SECh. A - For each statement in Exercises 21–24, write (a)...Ch. A - Prob. 23SECh. A - Prob. 24SECh. A - Prob. 25SECh. A - Prob. 26SECh. A - Prob. 27SECh. A - Prob. 28SECh. A - Prob. 29SECh. A - Prob. 30SECh. A - Prob. 31SECh. A - Prob. 32SECh. A - Prob. 33SECh. A - Prob. 34SECh. A - Prob. 35SECh. A - Prob. 36SECh. A - Prob. 37SECh. A - Prob. 38SECh. A - Prob. 39SECh. A - Prob. 40SECh. A - Prob. 41SECh. A - Prob. 42SECh. A - Prob. 43SECh. A - Prob. 44SE
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