True or false a. Every permutation is a one-to-one function b. Every function is a permutation iff it is one-to-one c. Every function from a finite set to itself must be one-to-one
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- Suppose that the abelian group G can be written as the direct sum G=C22C3C3, where Cn is a cyclic group of order n. Prove that G has elements of order 12 but no element of order greater than 12. Find the number of distinct elements of G that have order 12.15. Assume that can be written as the direct sum , where is a cyclic group of order . Prove that has elements of order but no elements of order greater than Find the number of distinct elements of that have order .Exercises 18. Suppose and let be defined by . Prove or disprove that is an automorphism of the additive group .
- Find a subset of Z that is closed under addition but is not subgroup of the additive group Z.34. Suppose that and are subgroups of the group . Prove that is a subgroup of .Label each of the following statements as either true or false. Two groups can be isomorphic even though their group operations are different.
- (See Exercise 31.) Suppose G is a group that is transitive on 1,2,...,n, and let ki be the subgroup that leaves each of the elements 1,2,...,i fixed: Ki=gGg(k)=kfork=1,2,...,i For i=1,2,...,n. Prove that G=Sn if and only if HiHj for all pairs i,j such that ij and in1. A subgroup H of the group Sn is called transitive on B=1,2,....,n if for each pair i,j of elements of B there exists an element hH such that h(i)=j. Suppose G is a group that is transitive on 1,2,....,n, and let Hi be the subgroup of G that leaves i fixed: Hi=gGg(i)=i For i=1,2,...,n. Prove that G=nHi.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 .10. Suppose that and are subgroups of the abelian group such that . If is a subgroup of such that , prove that .