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Math 110: Worksheet 1 Solutions

Math 110: Worksheet 1 SolutionsAugust 30 Thursday Aug. 241. Determine whether or not the following sets form vector spaces over the given fields.(a) The setVof all matrices of the form(1ab1)wherea, b R, overRwith standardaddition and scalar thatVis not closed under addition: fora, b, c, d R, we have(1ab1)and(1cd1)but(1ab1)+(1cd1)=(2a+ cb+d2)/ conclude thatVis not a vector space with the given operations.(b) The setVof all matrices of the form(1ab1)wherea, b R, overRwith addition and scalar multiplication defined by(1ab1) (1cd1)=(1a+cb+d1), k (1ab1)=(1kakb1).We claim thatVis indeed a vector space with the given operations. Note firstthatVis closed under the addtion and scalar multiplication operations: for(1ab1),(1cd1) Vandk R, we have(1ab1) (1cd1)=(1a+cb+d1) Vandk (1ab1)=(1kakb1) 1:Observe that(1ab1) (1cd1)=(1a+cb+d1)( defn.)

i by setting t = 0 in the de nitions. let x;y 2W i. There then exist t;s 2R such that x = tv i and y = sv i so that x+ y = tv i + sv i = (t+ s)v i 2W i: 6 let x 2W i and a 2R. Note then that ax = a(tv i) = (at)v i 2W i: We conclude that both W 1 and W 2 are subspaces of V. (b) Show that V = W 1 W 2. We need to show that (i) W 1 \W 2 = f0gand ...

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