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Math
AlgebraElements Of Modern Algebra8th Edition

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Chapter 1.2, Problem 3E
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Elements Of Modern Algebra

8th Edition
Gilbert + 2 others
ISBN: 9781285463230

Solutions

Chapter
Section
Problem 1TFE
Problem 2TFE
Problem 3TFE
Problem 4TFE
Problem 5TFE
Problem 6TFE
Problem 7TFE
Problem 8TFE
Problem 9TFE
Problem 1E
Problem 2E
Problem 3E
Problem 4E
Problem 5E
Problem 6E
Problem 7E
Problem 8E
Problem 9E
Problem 10E
Problem 11E
Problem 12E
Problem 13E
Problem 14E
Problem 15E
Problem 16E
Problem 17E
Problem 18E
Problem 19E
Problem 20E
Problem 21E
Problem 22E
Problem 23E
Problem 24E
Problem 25E
Problem 26E
Problem 27E
Problem 28E
BuyFindarrow_forward

Elements Of Modern Algebra

8th Edition
Gilbert + 2 others
ISBN: 9781285463230
Textbook Problem
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For each of the following mappings, write out f ( S ) and f − 1 ( T ) for the given S and T , where f :     Z   →   Z .

a. f ( x )   =   |   x   |   ;     S   =   Z   −   E   ,     T =   {   1   ,   3   ,   4   }

b. f ( x )   =   { x   +   1 if  x     is even x if  x     is odd;                           S     =   { 0 ,   1 ,   5 ,   9 }               T =   Z   −   E

c. f ( x )   =     x 2     ;         S     =   {   − 2   ,   − 1   ,   0   ,   1   ,   2 }   ,     T =   {   2   ,   7   ,   11   }  

d. f ( x )   =     | x | − x     ;         S     =     T =     {   − 7   ,   − 1   ,   0   ,   2   ,   4   }   .

(a)

To determine

f(S) and f−1(T) for the given S and T, where f:ℤ→ℤ defined by f(x)=|x|;   S=ℤ−E,   T={1,  3,  4}

Explanation

Given information:

f(x)=|x|;  S=ℤ−E, T={1,3,4}

Formula used:

1) If f:A→B and S⊆A, then

f(S)={y|y∈B  and y=f(x)  for some x∈S}

The set f(S) is called the image of S under f.

2) For any subset T of B, the inverse image of T denoted by f−1(T) and is defined by

f−1(T)={x|x∈A  and f(x)∈T}

3) For any real number x, the absolute value or modulus of x is denoted by |x| and is defined as,

|x| = {x,         if x≥0−x,     if x<0

Explanation:

The set S= ℤ−E= {±1,  ±3,  ±5,  ±7,  …} is a set of odd integers.

As |k| =k,  |−k| =k for any real number

Let k be any positive odd integer,

f(k) =  |k|  =  k;   k∈ℤ−E

Let −k be any negative odd integer,

f(−k)  =  |−k| =  k;   −k∈ℤ−E

Hence, f(S)= f(ℤ−E) = f({±1,  ±3,  ±5,  ±7,  …})

= { 1,  3,  5,  7,  …} is a set of positive odd integers

(b)

To determine

f(S) and f−1(T) for the given S and T, where f:ℤ→ℤ defined by f(x)= {x+1    if x  is even x       if x  is odd,   S= {0,  1,  5,  9},   T=ℤ−E

(c)

To determine

f(S) and f−1(T) for the given S and T, where f:ℤ→ℤ defined by f(x)=x2,  S= {−2, −1,  0,  1,  2},  T= {2,  7,  11}

(d)

To determine

f(S) and f−1(T) for the given S and T, where f:ℤ→ℤ defined by f(x)=|x|−x,   S=  T={−7,  −1,  0,   2,  4}

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Sect-1.1 P-1TFESect-1.1 P-2TFESect-1.1 P-3TFESect-1.1 P-4TFESect-1.1 P-5TFESect-1.1 P-6TFESect-1.1 P-7TFESect-1.1 P-8TFESect-1.1 P-9TFESect-1.1 P-10TFE
Sect-1.1 P-1ESect-1.1 P-2ESect-1.1 P-3ESect-1.1 P-4ESect-1.1 P-5ESect-1.1 P-6ESect-1.1 P-7ESect-1.1 P-8ESect-1.1 P-9ESect-1.1 P-10ESect-1.1 P-11ESect-1.1 P-12ESect-1.1 P-13ESect-1.1 P-14ESect-1.1 P-15ESect-1.1 P-16ESect-1.1 P-17ESect-1.1 P-18ESect-1.1 P-19ESect-1.1 P-20ESect-1.1 P-21ESect-1.1 P-22ESect-1.1 P-23ESect-1.1 P-24ESect-1.1 P-25ESect-1.1 P-26ESect-1.1 P-27ESect-1.1 P-28ESect-1.1 P-29ESect-1.1 P-30ESect-1.1 P-31ESect-1.1 P-32ESect-1.1 P-33ESect-1.1 P-34ESect-1.1 P-35ESect-1.1 P-36ESect-1.1 P-37ESect-1.1 P-38ESect-1.1 P-39ESect-1.1 P-40ESect-1.1 P-41ESect-1.1 P-42ESect-1.1 P-43ESect-1.2 P-1TFESect-1.2 P-2TFESect-1.2 P-3TFESect-1.2 P-4TFESect-1.2 P-5TFESect-1.2 P-6TFESect-1.2 P-7TFESect-1.2 P-8TFESect-1.2 P-9TFESect-1.2 P-1ESect-1.2 P-2ESect-1.2 P-3ESect-1.2 P-4ESect-1.2 P-5ESect-1.2 P-6ESect-1.2 P-7ESect-1.2 P-8ESect-1.2 P-9ESect-1.2 P-10ESect-1.2 P-11ESect-1.2 P-12ESect-1.2 P-13ESect-1.2 P-14ESect-1.2 P-15ESect-1.2 P-16ESect-1.2 P-17ESect-1.2 P-18ESect-1.2 P-19ESect-1.2 P-20ESect-1.2 P-21ESect-1.2 P-22ESect-1.2 P-23ESect-1.2 P-24ESect-1.2 P-25ESect-1.2 P-26ESect-1.2 P-27ESect-1.2 P-28ESect-1.3 P-1TFESect-1.3 P-2TFESect-1.3 P-3TFESect-1.3 P-4TFESect-1.3 P-5TFESect-1.3 P-6TFESect-1.3 P-1ESect-1.3 P-2ESect-1.3 P-3ESect-1.3 P-4ESect-1.3 P-5ESect-1.3 P-6ESect-1.3 P-7ESect-1.3 P-8ESect-1.3 P-9ESect-1.3 P-10ESect-1.3 P-11ESect-1.3 P-12ESect-1.4 P-1TFESect-1.4 P-2TFESect-1.4 P-3TFESect-1.4 P-4TFESect-1.4 P-5TFESect-1.4 P-6TFESect-1.4 P-7TFESect-1.4 P-8TFESect-1.4 P-9TFESect-1.4 P-1ESect-1.4 P-2ESect-1.4 P-3ESect-1.4 P-4ESect-1.4 P-5ESect-1.4 P-6ESect-1.4 P-7ESect-1.4 P-8ESect-1.4 P-9ESect-1.4 P-10ESect-1.4 P-11ESect-1.4 P-12ESect-1.4 P-13ESect-1.4 P-14ESect-1.4 P-15ESect-1.4 P-16ESect-1.5 P-1TFESect-1.5 P-2TFESect-1.5 P-3TFESect-1.5 P-1ESect-1.5 P-2ESect-1.5 P-3ESect-1.5 P-4ESect-1.5 P-5ESect-1.5 P-6ESect-1.5 P-7ESect-1.5 P-8ESect-1.5 P-9ESect-1.5 P-10ESect-1.6 P-1TFESect-1.6 P-2TFESect-1.6 P-3TFESect-1.6 P-4TFESect-1.6 P-5TFESect-1.6 P-6TFESect-1.6 P-7TFESect-1.6 P-8TFESect-1.6 P-9TFESect-1.6 P-10TFESect-1.6 P-11TFESect-1.6 P-12TFESect-1.6 P-1ESect-1.6 P-2ESect-1.6 P-3ESect-1.6 P-4ESect-1.6 P-5ESect-1.6 P-6ESect-1.6 P-7ESect-1.6 P-8ESect-1.6 P-9ESect-1.6 P-10ESect-1.6 P-11ESect-1.6 P-12ESect-1.6 P-13ESect-1.6 P-14ESect-1.6 P-15ESect-1.6 P-16ESect-1.6 P-17ESect-1.6 P-18ESect-1.6 P-19ESect-1.6 P-20ESect-1.6 P-21ESect-1.6 P-22ESect-1.6 P-23ESect-1.6 P-24ESect-1.6 P-25ESect-1.6 P-26ESect-1.6 P-27ESect-1.6 P-28ESect-1.6 P-29ESect-1.6 P-30ESect-1.6 P-31ESect-1.6 P-32ESect-1.7 P-1TFESect-1.7 P-2TFESect-1.7 P-3TFESect-1.7 P-4TFESect-1.7 P-5TFESect-1.7 P-6TFESect-1.7 P-1ESect-1.7 P-2ESect-1.7 P-3ESect-1.7 P-4ESect-1.7 P-5ESect-1.7 P-6ESect-1.7 P-7ESect-1.7 P-8ESect-1.7 P-9ESect-1.7 P-10ESect-1.7 P-11ESect-1.7 P-12ESect-1.7 P-13ESect-1.7 P-14ESect-1.7 P-15ESect-1.7 P-16ESect-1.7 P-17ESect-1.7 P-18ESect-1.7 P-19ESect-1.7 P-20ESect-1.7 P-21ESect-1.7 P-22ESect-1.7 P-23ESect-1.7 P-24ESect-1.7 P-25ESect-1.7 P-26ESect-1.7 P-27ESect-1.7 P-28ESect-1.7 P-29ESect-1.7 P-30E

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