EBK MATHEMATICS FOR MACHINE TECHNOLOGY
7th Edition
ISBN: 9780100548169
Author: SMITH
Publisher: YUZU
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Textbook Question
Chapter 2, Problem 8A
Determine the lowest common denominators of the following sets of fractions.
8.
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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 2 Solutions
EBK MATHEMATICS FOR MACHINE TECHNOLOGY
Ch. 2 - Reduce the fraction 1530to halves.Ch. 2 - Reduce 1230to lowest terms.Ch. 2 - Express 118and ?32as equivalent fractions.Ch. 2 - Express the mixed number 735as an improper...Ch. 2 - Express 9712 as a mixed number.Ch. 2 - Express the mixed number 935as an improper...Ch. 2 - Determine the lowest common denominators of the...Ch. 2 - Determine the lowest common denominators of the...Ch. 2 - Determine the lowest common denominators of the...Ch. 2 - Determine the lowest common denominators of the...
Ch. 2 - Express these fractions as equivalent fractions...Ch. 2 - Express these fractions as equivalent fractions...Ch. 2 - Express these fractions as equivalent fractions...Ch. 2 - Prob. 14ACh. 2 - Prob. 15ACh. 2 - Determine the overall length, width, and height of...Ch. 2 - Determine dimensions A, B, C, D, E, F, and G of...Ch. 2 - Determine dimensions A, B, C, and D of pin in...Ch. 2 - The operation sheet for machining an aluminum...
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