Linear Algebra Final Review

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Questions and Answers

Does a polynomial of degree less than 7 form a 7-dimensional subspace of the linear space of all polynomials?

True (A)

The claim is that the function T(f)=3f-4f' is a linear transformation.

True (A)

The claim is that all 2x2 triangular matrices form a subspace of the space of all 2x2 matrices.

True (A)

The claim is that the kernel of a linear transformation is a subspace of the domain.

<p>True (A)</p> Signup and view all the answers

The claim is that the space R^(2x3) is 5-dimensional.

<p>False (B)</p> Signup and view all the answers

The claim is that if f1,...,f(n) is a basis of a linear space V, then any element of V can be written as a linear combination of f1,...,f(n).

<p>True (A)</p> Signup and view all the answers

The claim is that the space P1 is isomorphic to C.

<p>False (B)</p> Signup and view all the answers

The claim is that if the kernel of a linear transformation T from P4 to P4 is {0}, then T must be an isomorphism.

<p>True (A)</p> Signup and view all the answers

The claim is that if W1 and W2 are subspaces of a linear space V, then the intersection W1 ∩ W2 must be a subspace of V as well.

<p>True (A)</p> Signup and view all the answers

The claim is that all bases of P3 contain at least one polynomial of degree equal to or less than 2.

<p>True (A)</p> Signup and view all the answers

The claim is that if T is an isomorphism then T(-1) is an isomorphism as well.

<p>True (A)</p> Signup and view all the answers

The claim is that all linear transformations from P3 to R^(2x2) are isomorphisms.

<p>False (B)</p> Signup and view all the answers

The claim is that the space of all upper triangular 4x4 matrices is isomorphic to the space of all lower triangular 4x4 matrices.

<p>True (A)</p> Signup and view all the answers

The claim is that there exists a 2x2 matrix A such that the space of all matrices commuting with A is one-dimensional.

<p>False (B)</p> Signup and view all the answers

The claim is that if W is a subspace of V and W is finite dimensional then V must be finite dimensional as well.

<p>False (B)</p> Signup and view all the answers

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Study Notes

Polynomials and Subspaces

  • A polynomial of degree less than 7 forms a 7-dimensional subspace, with a basis including constants and terms up to (t^6).
  • Subspaces have closed operations under addition and scalar multiplication, exemplified by lower triangular matrices.

Linear Transformations

  • The function (T(f)=3f-4f') qualifies as a linear transformation since both components are linear.
  • The kernel of a linear transformation indicates that if it's {0}, then the transformation is an isomorphism.

Matrix Spaces and Dimensions

  • (R^{2x3}) is 6-dimensional, accommodating all possible 2x3 matrices, contrary to the claim that it is 5-dimensional.
  • The dimension of (P_1) is 1 while the dimension of (\mathbb{C}) is 2, establishing that they are not isomorphic.

Isomorphism Criteria

  • A transformation is deemed an isomorphism if its kernel is zero, and its image before and after transformation remains identical.
  • If (T) is an isomorphism, then its inverse (T^{-1}) remains an isomorphism due to linearity.

Subspace Intersections

  • The intersection of two subspaces (W_1) and (W_2) yields another subspace, consistent with the properties of subspace definitions.

Basis Requirements

  • A basis of (P_3) must include polynomials of degrees 0, 1, 2, and 3 to adequately span the space.
  • There cannot be a 2x2 matrix (A) such that the space of matrices commuting with (A) is one-dimensional, as (I_2) commutes with any 2x2 matrix.

Dimensional Relationships

  • A finite-dimensional subspace (W) does not guarantee that the entire space (V) is finite-dimensional.

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