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- 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.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 .Let α =21/8 and let K = Q(α,i). Show that (a) K is the splitting field of x8 −2 over Q and dimQ(K) = 16Let α =21/8 and let K = Q(α,i). Show that (a) K is the splitting field of x8 −2 over Q and dimQ(K) = 16
- Prove that Z ≈ E*, where Z is the set of integers and E* is the set of positive even integers.Suppose that a and b belong to a field of order 8 and that a2 + ab + b2 = 0. Prove that a = 0 and b = 0. Do the same when the field hasorder 2n with n odd.Prove that every set D ⊆ ℕ that is definable in N := (ℕ, 0, S , +, ·) is actually ∅-definable.
- Find the orders of all elements in Group D4({1,2,3,4,5,6}under x mod 7)(a) Suppose that there are 6 people in a room. Show that one can always find a group of 3 people such that either nobody in the group knows anybody in the group or everybody in the group knows everyone in the group.(b) Show that this conclusion does not hold if there are only 5 people in the room.