ses Being a mathematician is a bit like being a manic depressive: you spend your life alternating between giddy elation and black despair. STEVEN G. KRANTZ, A Primer of Mathematical Writing 1. Find an isomorphism from the group of integers under addition to the group of even integers under addition. 2. Find Aut(Z). 3.Let R be the group of positive real numbers under multiplication. Show that the mapping d(x) = Vx is an automorphism of R. 4. Show that U(8) is not isomorphic to U(10). 5. Show that U(8) is isomorphic to U(12). 6. Prove that isomorphism is an equivalence relation. That is, for any groups G, H, and K, G G, G ~ Himplies H ~ G, and G H K implies G K. 7. Prove that S is not isomorphic to D2 8. Show that the mapping a- log 0 a is an i under multiplication to R under addition. 22 sm f denti

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter3: Groups
Section3.4: Cyclic Groups
Problem 16E: For an integer n1, let G=Un, the group of units in n that is, the set of all [ a ] in n that have...
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ses
Being a mathematician is a bit like being a manic depressive: you spend
your life alternating between giddy elation and black despair.
STEVEN G. KRANTZ, A Primer of Mathematical Writing
1. Find an isomorphism from the group of integers under addition to
the group of even integers under addition.
2. Find Aut(Z).
3.Let R be the group of positive real numbers under multiplication.
Show that the mapping d(x) = Vx is an automorphism of R.
4. Show that U(8) is not isomorphic to U(10).
5. Show that U(8) is isomorphic to U(12).
6. Prove that isomorphism is an equivalence relation. That is, for any
groups G, H, and K, G G, G ~ Himplies H ~ G, and G
H K implies G K.
7. Prove that S is not isomorphic to D2
8. Show that the mapping a- log 0 a is an i
under multiplication to R under addition.
22
sm f
denti
Transcribed Image Text:ses Being a mathematician is a bit like being a manic depressive: you spend your life alternating between giddy elation and black despair. STEVEN G. KRANTZ, A Primer of Mathematical Writing 1. Find an isomorphism from the group of integers under addition to the group of even integers under addition. 2. Find Aut(Z). 3.Let R be the group of positive real numbers under multiplication. Show that the mapping d(x) = Vx is an automorphism of R. 4. Show that U(8) is not isomorphic to U(10). 5. Show that U(8) is isomorphic to U(12). 6. Prove that isomorphism is an equivalence relation. That is, for any groups G, H, and K, G G, G ~ Himplies H ~ G, and G H K implies G K. 7. Prove that S is not isomorphic to D2 8. Show that the mapping a- log 0 a is an i under multiplication to R under addition. 22 sm f denti
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