7.2.5 Let" ε C" be a nonzero column vector and set A-lilt E C(n, n) (i)...
Let {v1, ..., vk} ⊂ R n be nonzero mutually orthogonal vectors (i.e. every vector in the set is orthogonal to every other vector in the set) and define the n × k matrix A = [ v1 · · · vk ] . Show that the only solution to Ax = 0 is the trivial solution.
0/1 pts Inooreat Question 9 Suppose W is a subspace of R" spanned by n nonzero orthogonal vectors. Explain why WR Two subspaces are the same when one subspace is a subset of the other subspace. Two subspaces are the same when they are spanned by the same vectors Two subspaces are the same when they are subsets of the same space Two subspaces are the same when they have the same dimension Incorrect 0/1 pts Question 10 Let U...
Problem 4. Let n E N, and let V be an n-dimensional vector space. Let(, ,): V × V → R be an nner product on V (a) Prove that there exists an isomorphism T: V -R" such that (b) Is the isomorphism T you found in part (a) unique? Give a proof or a counterexample. (c) Let A be an n × n symmetric matrix such that T A > 0 for all nonzero ERT. Show that there exists...
A1. Let (A, B, C, D) be a SISO system in which A is a (n x n) complex matrix and B a (n x 1) column vector, let -1 V = {£ajA*B: aj e C; j= 0, ...,n- (i) Show that V is a complex vector space. (ii) Show that V has dimension one, if and only if B is an eigenvector of A AX for X E V. Show that S defines a linear map from S: V...
Problem 5. A subset A C R', is an afǐпє subspace of Rn if there exists a vector b underlying vector subspace W of R" such that Rn and an (a) Describe all the affine subspaces of IR2 which are not vector subspaces of R2 (b) Consider A e R"Xn, beR" and the system of linear equations Ar- b. Prove that: (i) if A-b is consistent, then its solution set is an affine subspace of R" with underlying (ii) if...
12.3 Least angle property of least squares. Suppose the m × n matrix A has linearly independent columns, and b is an m-vector. Let x ATb denote the least squares approximate solution (a) Show that for any n-vector a, (Ax)Tb - (Aa)"(Aâ), i.e., the inner product of Ax and b is the same as the inner product of Ax and Ai. Hint. Use (Ax)b (ATb) and (ATA)2 = ATb (b) Show that when A and b are both nonzero, we...
Help me plz to solve questions a and b 9. (10pts) Answer only four parts by True/False and provide justifica- tions] Given A, B and C three n × n matrices: (a) If C'is a nonsingular skew-symmetric matrix, then its inverse is also skew symmetric b) If rank(A) and AB- AC then B- C c) Let S-V, V2, Vs) be a lnearly independent set of vectors in a vector space V and T V2, V2+Vs, ViVs); then T is linearly...
The random vector Y = (Y1, ..., Yn)T is such that Y = Xβ + ε, where X is an n × p full-rank matrix of known constants, β is a p-length vector of unknown parameters, and ε is an n-length vector of random variables. A multiple linear regression model is fitted to the data. (a) Write down the multiple linear regression model assumptions in matrix format. (b) Derive the least squares estimator β^ of β. (c) Using the data:...
Let A be an m × n matrix, let x Rn and let 0 be the zero vector in Rm. (a) Let u, v є Rn be any two solutions of Ax 0, and let c E R. Use the properties of matrix-vector multiplication to show that u+v and cu are also solutions of Ax O. (b) Extend the result of (a) to show that the linear combination cu + dv is a solution of Ax 0 for any c,d...