Suppose c is a conjugacy class in a с group G such that IC is finite but | c/#1. Then there exists an cement of in G that does g not commute with element of C. Show that hypothesis of any finiteness of IC | is necessary for this.
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- 27. Suppose that is a nonempty set that is closed under an associative binary operation and that the following two conditions hold: There exists a left identity in such that for all . Each has a left inverse in such that . Prove that is a group by showing that is in fact a two-sided identity for and that is a two-sided inverse of .Let n be appositive integer, n1. Prove by induction that the set of transpositions (1,2),(1,3),...,(1,n) generates the entire group Sn.15. Prove that on a given collection of groups, the relation of being a homomorphic image has the reflexive property.
- Exercises 18. Suppose and let be defined by . Prove or disprove that is an automorphism of the additive group .9. Find all elements in each of the following groups such that . under addition. under multiplication.9. The definition of an even integer was stated in Section 1.2. Prove or disprove that the set of all even integers is closed with respect to a. addition defined on . b. multiplication defined on .
- 42. For an arbitrary set , the power set was defined in Section by , and addition in was defined by Prove that is a group with respect to this operation of addition. If has distinct elements, state the order of .19. a. Show that is isomorphic to , where the group operation in each of , and is addition. b. Show that is isomorphic to , where all group operations are addition.Exercises 11. According to Exercise of section, if is prime, the nonzero elements of form a group with respect to multiplication. For each of the following values of , show that this group is cyclic. (Sec. ) a. b. c. d. e. f. 33. a. Let . Show that is a group with respect to multiplication in if and only if is a prime. State the order of . This group is called the group of units in and designated by . b. Construct a multiplication table for the group of all nonzero elements in , and identify the inverse of each element.
- 15. Let be a binary operation on the non empty set . Prove that if contains an identity element with respect to , the identity element is unique.If a is an element of order m in a group G and ak=e, prove that m divides k.10. Let be an integer, and let be a fixed integer. Prove or disprove that the set, is subgroup of under addition.