MATH 235 W22 - A2
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MATH 235 W22 - A2
Question 1
Consider the following subsets of V = Co (R).
Determine whether they are vector subspaces or not.
If the subset is a subspace of Co (R), then write YES, and prove that it is. If the subset is not a subspace of Co (R), then write NO, and prove that it is not.
(a) W1 = {g(x) ∈ V : g(0) + g(1) = 1}.
(b) W2 = {g(x) ∈ V : g(0) + g(1) = 0}.
(c) W3 = {g(x) ∈ V : (g(0))(g(1)) = 0}.
(d) W4 = {g(x) ∈ V : g(x) + ╱ 、 = 1}. (e) W5 = {g(x) ∈ V : g(x) + ╱ 、 = 0}. (f) W6 = {g(x) ∈ V : (g(x)) ╱ 、 = 0}. (g) W7 = {g(x) ∈ V : (g(x)) ╱ − 1、= 0}.
(h) W8 = {g(x) ∈ V : g(x) + 2 ╱ 、 + 3 ╱ 、 = 0}.
(i) W9 = {g(x) ∈ V : g(x) + 2 ╱ 、 + 3 ╱ 、 = x2 }.
Question 2
Let V be a vector space and let S1 and S2 be non-empty subsets of V . (a) Show that if S1 ⊆ S2 , then Span(S1 ) ⊆ Span(S2 ).
(b) Show that if S1 ⊆ S2 , S1 S2 and Span(S1 ) = Span(S2 ), then S2 is linearly dependent.
(c) Show that if S1 and S2 are linearly independent, then S1 ∩ S2 is linearly independent.
(d) Give a counterexample to show that the following statement is false:
“if S1 and S2 are linearly dependent, then S1 ∩ S2 is linearly dependent.”
2022-02-16