5. Prove (using the subgroup condition rather than using the axioms) that the set a b 0 с ER} H 1= {( 8 6 ) : 0 : a, cЄR*, bЄR ‚cЄR*,bЄR is a subgroup of GL2(R)
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- 4. Prove that the special linear group is a normal subgroup of the general linear group .5. Exercise of section shows that is a group under multiplication. a. List the elements of the subgroupof , and state its order. b. List the elements of the subgroupof , and state its order. Exercise 33 of section 3.1. 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 is designated by . b. Construct a multiplication table for the group of all nonzero elements in , and identify the inverse of each element.Find all subgroups of the quaternion group.
- 45. Let . Prove or disprove that is a group with respect to the operation of intersection. (Sec. )Exercises 3. Find an isomorphism from the additive group to the multiplicative group of units . Sec. 16. For an integer , let , the group of units in – that is, the set of all in that have multiplicative inverses, Prove that is a group with respect to multiplication.12. Consider the mapping defined by . Decide whether is a homomorphism, and justify your decision.
- 1. Consider , the groups of units in under multiplication. For each of the following subgroups in , partition into left cosets of , and state the index of in a. b.32. Let be a fixed element of the group . According to Exercise 20 of section 3.5, the mapping defined by is an automorphism of . Each of these automorphism is called an inner automorphism of . Prove that the set forms a normal subgroup of the group of all automorphism of . Exercise 20 of Section 3.5 20. For each in the group , define a mapping by . Prove that is an automorphism of .9. For any let denote in and let denote in . a. Prove that the mapping defined by is a homomorphism. b. Find ker .