Let Ebe the set of even integers with ordinary addition. Define a new multiplication on E by the rule Tawbi- ab/2" (where the product on the right is ordinary multiplication). Prove that with these operations Eisa commutative ring with identity

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with ordinary addition and this new multiplication, Z is a commutative ring.
18. Define a new multiplication in Z by the rule: ab = 1 for all a, b, EZ. With
ordinary addition and this new multiplication, is Z is a ring?
19. Let S = {a, b, c} and let P(S) be the set of all subsets of S; denote the
elements of P(S) as follows:
S = {a, b, c}; D = {a, b}; E= {a, c}; F= {b, c};
A = {a}; B= {b}; C= {c}; 0 =Ø.
Define addition and multiplication in P(S) by these rules:
M + N = (M – N)U (N – M)
and
MN = MN N.
Write out the addition and multiplication tables for P(S). Also, see Exercise 44.
B. 20. Show that the subset R = {0, 3, 6, 9, 12, 15} of Z1g is a subring. Does R have
an identity?
21. Show that the subset S = {0, 2, 4, 6, 8} of Z10 is a subring. Does S have an
identity?
Ote 2012 Cp La A Rig taed May at be opind cd ar we ar la pt Dete droie d perty cotmy be eBodtdtr Cp Bralvew ta
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56
Chapter 3 Rings
22. Define a new addition O and multiplication O on Z by
a Ob = a + b - 1
and
aOb = a + b – ab,
where the operations on the right-hand side of the equal signs are ordinary
addition, subtraction, and multiplication. Prove that, with the new operations
O and O, Z is an integral domain.
23. Let E be the set of even integers with ordinary addition. Define a new sesat
multiplication on E by the rule “a * b = ab/2" (where the product on the
right is ordinary multiplication). Prove that with these operations E is a
commutative ring with identity.
24. Define a new addition and multiplication on Z by
a O b = a + b – 1
and
a O b = ab - (a + b) + 2.
Prove that with these new operations Z is an integral domain.
25. Define a new addition and multiplication on Q by
rOs=r+s+1
and
rOs = rs + r+s.
Prove that with these new operations Q is a commutative ring with identity. Is
it an integral domain?
Transcribed Image Text:Thomas W. Hungerford - Abstrac x O File | C:/Users/angel/Downloads/Thomas%20W.%20Hungerford%20-%20Abstract%20Algebra_%20AN%20lntroduction-Cengage%20Learning%20(2014).pdf ... Flash Player will no longer be supported after December 2020. Turn off Learn more of 621 + A) Read aloud V Draw F Highlight O Erase 78 with ordinary addition and this new multiplication, Z is a commutative ring. 18. Define a new multiplication in Z by the rule: ab = 1 for all a, b, EZ. With ordinary addition and this new multiplication, is Z is a ring? 19. Let S = {a, b, c} and let P(S) be the set of all subsets of S; denote the elements of P(S) as follows: S = {a, b, c}; D = {a, b}; E= {a, c}; F= {b, c}; A = {a}; B= {b}; C= {c}; 0 =Ø. Define addition and multiplication in P(S) by these rules: M + N = (M – N)U (N – M) and MN = MN N. Write out the addition and multiplication tables for P(S). Also, see Exercise 44. B. 20. Show that the subset R = {0, 3, 6, 9, 12, 15} of Z1g is a subring. Does R have an identity? 21. Show that the subset S = {0, 2, 4, 6, 8} of Z10 is a subring. Does S have an identity? Ote 2012 Cp La A Rig taed May at be opind cd ar we ar la pt Dete droie d perty cotmy be eBodtdtr Cp Bralvew ta dd te ny t doat dty ha he ov rngpet Cngge Laming righeo eddo y tme i gh o i 56 Chapter 3 Rings 22. Define a new addition O and multiplication O on Z by a Ob = a + b - 1 and aOb = a + b – ab, where the operations on the right-hand side of the equal signs are ordinary addition, subtraction, and multiplication. Prove that, with the new operations O and O, Z is an integral domain. 23. Let E be the set of even integers with ordinary addition. Define a new sesat multiplication on E by the rule “a * b = ab/2" (where the product on the right is ordinary multiplication). Prove that with these operations E is a commutative ring with identity. 24. Define a new addition and multiplication on Z by a O b = a + b – 1 and a O b = ab - (a + b) + 2. Prove that with these new operations Z is an integral domain. 25. Define a new addition and multiplication on Q by rOs=r+s+1 and rOs = rs + r+s. Prove that with these new operations Q is a commutative ring with identity. Is it an integral domain?
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