MATH 413/513, Section 001, Fall 2020
澳洲Math数学代写 Prove: there exists an invertible operator T (V ) such that T ˙u = S˙u for every ˙u U if and only if S is injective.
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Test 2
General hint: For problems in this test you can use any of the theorems we covered in class.
PART 1, in class, to be submitted no later than 1:00 p.m. 澳洲Math数学代写
(1)(10+10pt) Suppose ˙v1, …, ˙vm is a list of vectors in V. Define T ∈ L(Fm, V ) by
T (z1, …, zm) = z1˙v1 + … + zm˙vm
(a)Whatproperty of T corresponds to ˙v1, …, ˙vm spanning V ? Prove your assertion.
(b)Whatproperty of T corresponds to ˙v1, …, ˙vm being linearly independent? Proveit. 澳洲Math数学代写
(2)(15 pt) Suppose S, T ∈ L(V ) and ST = T S. Prove that null S is invariant under T.
(3)(15 pt) Consider differentiation operator D ( 4(R)), e. we are only considering polynomials of degree 4. Suppose polynomials 1, z, z2, z3, z4are chosen as a basis of 4(R). What’s the matrix M (D) of the operator D with respect to this basis? Provide the details of your derivation.
PART 2, take-home, to be submitted no later than 11:59 p.m. 澳洲Math数学代写
(4) (15 pt)
For Math 413 only: Suppose V is finite dimensional, U is subspace of V , and S (U, V ). Prove: there exists an invertible operator T (V ) such that T ˙u = S˙u for every ˙u U if and only if S is injective.
For Math 513 only: Show that V and L(F, V ) are isomorphic vector spaces.
(5) (15 pt) 澳洲Math数学代写
For Math 413 only: Suppose T (R2) is defined by T (x, y) = ( 3y, x). Find the eigen- values of T. Prove your answer. No determinants, please.
For Math 513 only: Suppose V is finite dimensional, T ∈ L(V ), and λ ∈ F. Prove that there exists α ∈ F such that |α − λ| < 0.001 and T − αI is invertible.
(6) (20 pt) Suppose p (R) (p is arbitrary!). Prove that there exists q (R) such that
qjjj + 3qjj + 4qj = p. Use notions of injectivity, surjectivity, dimension, etc.
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