Question

In: Advanced Math

Let C(R) be the vector space of continuous functions from R to R with the usual...

Let C(R) be the vector space of continuous functions from R to R with the usual addition and scalar multiplication. Determine if W is a subspace of C(R). Show algebraically and explain your answers thoroughly.

a. W = C^n(R) = { f ∈ C(R) | f has a continuous nth derivative}

b. W = {f ∈ C^2(R) | f''(x) + f(x) = 0}

c. W = {f ∈ C(R) | f(-x) = f(x)}.

Solutions

Expert Solution

a). { has a continuous nth derivative } .

Let , .

are continuous , where denotes nth derivative of .

Now , are also contiunuous as sum of two contunuous function are also continuous .

So W is closed under addition .

is also continuous

So W is closed under scalar multiplication .

Hence W is a subspace.

.

(b). { }

​​​​​​Let ,

Now ,

Also ,

So

Hence W is a subspace .

.

(c). { }

Let ,

Also

So W is closed under addition and salar multiplication . Hence W is subspace .


Related Solutions

Let V be the vector space of all functions f : R → R. Consider the...
Let V be the vector space of all functions f : R → R. Consider the subspace W spanned by {sin(x), cos(x), e^x , e^−x}. The function T : W → W given by taking the derivative is a linear transformation a) B = {sin(x), cos(x), e^x , e^−x} is a basis for W. Find the matrix for T relative to B. b)Find all the eigenvalues of the matrix you found in the previous part and describe their eigenvectors. (One...
Let p, q, g : R → R be continuous functions. Let L[y] := y'' +...
Let p, q, g : R → R be continuous functions. Let L[y] := y'' + py' + qy. (i) Explain what it means for a pair of functions y1 and y2 to be a fundamental solution set for the equation L[y] = 0. (ii) State a theorem detailing the general solution of the differential equation L[y] = g(t) in terms of solutions to this, and a related, equation.
Let X be the space of all continuous functions from [0, 1] to [0, 1] equipped...
Let X be the space of all continuous functions from [0, 1] to [0, 1] equipped with the sup metric. Let Xi be the set of injective and Xs be the set of surjective elements of A and let Xis = Xi ∩ Xs. Prove or disprove: i) Xi is closed, ii) Xs is closed, iii) Xis is closed, iv) X is connected, v) X is compact.
Let V be a finite dimensional vector space over R. If S is a set of...
Let V be a finite dimensional vector space over R. If S is a set of elements in V such that Span(S) = V , what is the relationship between S and the basis of V ?
(10pt) Let V and W be a vector space over R. Show that V × W...
(10pt) Let V and W be a vector space over R. Show that V × W together with (v0,w0)+(v1,w1)=(v0 +v1,w0 +w1) for v0,v1 ∈V, w0,w1 ∈W and λ·(v,w)=(λ·v,λ·w) for λ∈R, v∈V, w∈W is a vector space over R. (5pt)LetV beavectorspaceoverR,λ,μ∈R,andu,v∈V. Provethat (λ+μ)(u+v) = ((λu+λv)+μu)+μv. (In your proof, carefully refer which axioms of a vector space you use for every equality. Use brackets and refer to Axiom 2 if and when you change them.)
Problem 6. Let Pd (2, C) denote the vector space of C-polynomials in two variables, of...
Problem 6. Let Pd (2, C) denote the vector space of C-polynomials in two variables, of degree ≤ d. Define a linear map S : P2(2, C) → P2(C) by S(p) := p(z, z) (where z is a variable for the polynomials in P2(C)). (a) Prove that S is surjective and that Skew2(2, C) ⊂ ker(S). (b) Give an example of a polynomial in ker(S) \ Skew2(2, C). Hence write down a basis for ker(S).
Let V = R^2×2 be the vector space of 2-by-2 matrices with real entries over the...
Let V = R^2×2 be the vector space of 2-by-2 matrices with real entries over the scalar field R. We can define a function L on V by L : V is sent to V L = A maps to A^T , so that L is the “transpose operator.” The inner product of two matrices B in R^n×n and C in R^n×n is usually defined to be <B,C> := trace (BC^T) , and we will use this as our inner...
Let V be a vector space and let U and W be subspaces of V ....
Let V be a vector space and let U and W be subspaces of V . Show that the sum U + W = {u + w : u ∈ U and w ∈ W} is a subspace of V .
Vector v=(9,0,2) is vector from R3 space. Consider standard inner product in R3. Let W be...
Vector v=(9,0,2) is vector from R3 space. Consider standard inner product in R3. Let W be a subspace in R3 span by u = (9,2,0) and w=(9/2,0,2). a) Does V belong to W? show explanation b) find orthonormal basis in W. Show work c) find projection of v onto W( he best approximation of v with elements of w) d) find the distance between projection and vector v
Let φ : R −→ R be a continuous function and X a subset of R...
Let φ : R −→ R be a continuous function and X a subset of R with closure X' such that φ(x) = 1 for any x ∈ X. Prove that φ(x) = 1 for all x ∈ X.'  
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT