3. Let A: RnR be an operator that leaves a subspace E C Rª invariant. Let x: RR” be a solution of x' Ax. If x (to) € E for some to € R, show that x(t) € E for all t € R. -
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- Find an orthonormal basis for the subspace of Euclidean 3 space below. W={(x1,x2,x3):x1+x2+x3=0}Suppose U1; U2; :::; Um are Önite-dimensional subspaces of V .Prove thatU1 + U2 + ::: + Um is Önite-dimensionalanddim(U1 + U2 + ::: + Um) dim U1 + dim U2 + ::: + dim UmHow do you prove that W= im T when W is a T-invariant subspace, and V=ker + W. Where V is finite dimentional, when you let T be a element V.
- Let C2(-∞,∞)={f(x) in C(-∞,∞)|f''(x) exists for all x} be the set of differential functions. Show this is a subspace of C(-∞,∞).Label the following statements as true or false.{a) The set of solut ions to an nth-order homogeneous linear differentialequation with constant coefficients is an n-dimensional subspace ofcoo. (b) The solution space of a homogeneous linear differential equationwith constant coefficients is the null space of a differential operator.(c) The auxiliary polynomial of a homogeneous linear differentialequation with constant coefficients is a solution to the differentialequation.(d) Any solution to a homogeneous linear different ial equation withconst ant coefficients is of the form aect or atkect , where a and care complex numbers and k is a positive integer. (e) Any linear combination of solutions to a given homogeneous lineardifferential equation with constant coefficients is also a solution tothe given equation.For each of the following parts, determine whether the statement is trueor false. Justify your claim with either a proof or a counterexample,whichever is appropriate.(a) Any finite dimensional subspace of C∞ is the solution space of ahomogeneous linear differential equation with constant coefficients. (b ) There exists a homogeneous linear differential equation with constant coefficients whose solution space has the basis { t , t2 }. (c) For any homogeneous linear differential equation with constantcoefficients, if x is a solution to the equation, so is its derivative x'.
- Let S=span(e1), T=span(e2) and W=span(e1+e3) be subspaces of R3. S is orthogonal to T, T is orthogonal to W, then S is orthogonal to W. true or false?Consider the subspace Wof D, given by W = span (cos x, sin x, x cos x, x sin x). (a) Find the matrix of D with respect to B = {cos x, sin x, x cos x, x sin x}. (b) Compute the derivative off(x) = cos x + 2x cos x indirectly, , and verify that it agrees withf'(x) as computed directly.Consider the subspace W of D, given by W = span(e2x, e2x cos x, e2x sin x). (a) Find the matrix of D with respect to B = {e2x, e2x cos x, e2x sin x}. (b) Compute the derivative of f(x) = 3e2x - e2xcosx+ 2e2x sin x indirectly, using and verify that it agrees with f' (x) as computed directly.
- Consider the subspace W of D, given by W = span(sin x, cos x). (a) Show that the differential operator D maps W into itself. (b) Find the matrix of D with respect to B = {sin x, cos x}. (c) Compute the derivative of f(x) = 3 sin x - 5 cos x indirectly and verify that it agrees with f'(x) as computed directly.Let V be the subspace of C[a, b] spanned by1, ex, e−x, and let D be the differentiation operatoron V. Find the matrix A representing D with respect to the ordered basis [1, cosh x, sinhx].Suppose U and W are two-dimensional subspaces of R3. Show that U∩W≠{0}