Q4 (5 points). Let V be a vector space with two subspaces S and T. Assume...
a. Let W and X both be subspaces of a vector space V. Prove that dim(WnX) > dim(W) + dim(X) - dim(V) b. Define a plane in R" (as a vector space) to be any subspace of dimension 2, and a line to be any subspace of dimension 1. Show that the intersection of any two planes in R' contains a line. c. Must the intersection of two planes in R* contain a line?
1. (10 points) Suppose that U and W are subspaces of a vector space V such that vi,, , ,tk İs a basis of U and wi,. . . , wn, V1, . , Uk is a basis of W. m, W1,.. ., Wn,v],.. . ,vk is a basis of U +W, and deduce that dim(U+W)- Show that u1,. .. , w1, dim(U) + dim(W) - dim(Unw).
Let W1 and W, be the subspaces of a vector space V. Show that WinW, is a subspace of V.
Q4 6 Points Let V be a vector space over R and let Vi, ..., Ur each be a vector in V\{0}. Show that (v1,..., Vre) is linear independent if and only if span(v1,..., vi) n span(Vi+1,...,Vn) = {0} for all i = 1,...,n-1 Please select file(s) Select file(s)
6. (a) Suppose that Wi and W2 are both four-dimensional subspaces of a vector space V of dimension seven. Explain why W1 n W3 {0 (b) Suppose V is a vector space of dimension 55, and let Wi and W2 be subspaces of V of dimension 36 and 28 respectively. What is the least possible value and the greatest possible value of dim(Wi + W2)?
9) Consider a vector space W where dim W= m (m-dimensional) Assume two subspaces V1, V2 such that dim (V1) = m-1 =dim (V2). now show that if V1#V2 , then we have dim(V1, V2) = m – 2.
Let V be a vector space over a field F, and let U and W be finite dimensional subspaces of V. Consider the four subspaces X1 = U, X2 = W, X3 = U+W, X4 = UnW. Determine if dim X; <dim X, or dim X, dim X, or neither, must hold for every choice of i, j = 1,2,3,4. Prove your answers.
Q4 6 Points Let V be a vector space over R and let V1, ... , Vn each be a vector in V \{0}. Show that (v1, ..., Vn) is linear independent if and only if span(v1, ... , Vi) n span(vi+1, ..., Vn) = {0} for all i = 1,...,n - 1
Problem 4. Let V be a vector space and let U and W be two subspaces of V. Let (1) Prove that if U g W and W g U then UUW is not a subspace of V 2) Give an ezample of V, U and W such that U W andW ZU. Explicitly verify the implication of the statement in part (1) (3) Prove that UUW is a subspace of V if and only ifUCW or W CU.' (4)...
Let V be a finite-dimensional complex vector space and let T from V to V be a linear transformation. Show that V is the direct sum of U and W where W and U are T-invariant subspaces and the restriction of T on U is nilpotent and the restriction of T on W is an isomorphism.