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- Complete Example 2 by verifying that {1,x,x2,x3} is an orthonormal basis for P3 with the inner product p,q=a0b0+a1b1+a2b2+a3b3. An Orthonormal basis for P3. In P3, with the inner product p,q=a0b0+a1b1+a2b2+a3b3 The standard basis B={1,x,x2,x3} is orthonormal. The verification of this is left as an exercise See Exercise 17..Prove statement d of Theorem 3.9: If G is abelian, (xy)n=xnyn for all integers n.Exercises 10. Prove Theorem 5.4:A subset of the ring is a subring of if and only if these conditions are satisfied: is nonempty. and imply that and are in .
- [Type here] Examples 5 and 6 of Section 5.1 showed that is a commutative ring with unity. In Exercises 4 and 5, let . 4. Is an integral domain? If not, find all zero divisors in . [Type here]which is the collection of all polynomials of degree ≤ 3. Write out the standard basis for P2? What is the dimension of P2? Is it possible for the dimension to be some other number as well? Explain. (2) Why is the following true? If {p1, p2, p3} spans P2 then it is a basis for P2. (1) Let p1 = 2−x+x2 , p2 = 1+x, p3 = x+x2 . Show that S = {p1, p2, p3} spans P2. Conclude that S is a basis for P2. (5) Using (2.3) or otherwise, write p = 3 + 5x − 4x2 as a linear combination of p1, p2 and p3. Show all working. Hence find (p)S, the coordinate vector of p relative to S. (2) Explain why are the vectors q1 = 8 + 4x − 6x2 and q2 = −4 − 2x + 3x2 are linearly dependent in P2? (2)(1) Show that the set S = {x, x + 1, (x + 1)^2} is a basis for the vector space P3 ofpolynomials of degree at most 2. (2) What are the coordinates of the polynomial x^2 + x + 1 with respect to the basis given in part 1?
- 1. Find a basis for the nullspace of AShow that the families defined in Examples 5.3.1, 5.3.2, 5.3.3, and 5.3.4 are in fact uniformities. Example 5.3.1. Given a prime number p, the p-adic uniformity on Z is generated by the entourages of the form:Dn = {(x, y) ∈ Z × Z : x ≡ y mod pn}, n ∈ N \ {0}. Example 5.3.2. The additive uniformity on a topological vector space E, has a basis formed by entourages of the form: {(x, y) ∈ E × E : x − y ∈ V }, where V is a neighborhood of the zero vector of E. Example 5.3.3. The left uniformity UL(G) on a topological group G, has a basis formed by entourages of the form: {(x, y) ∈ G × G : x−1y ∈ V },where V is a neighborhood of the identity element of G. Analogously, the right uniformity UR(G) is generated by the entourages of the form: {(x,y)∈G×G:xy−1 ∈V}, where V is a neighborhood of the identity element of G. Obviously, if G is an Abelian group, UL(G) and UR(G) coincide. Example 5.3.4. The (pseudo)metric uniformity on a (pseudo)metric space (X, d) is generated by the entourages Vεd :=…Theorem [4.1.9] The set S = {T, (U) | U is open in X} U {T2 (V)|V is open in Y} is a subbasis for the product topology on X × Y. -1 Proof : H.W
- Let X={a,b,c} and B={{a,c},{a},{b}}. Show that B is a basis for a topology on X.Prove that R with the standard topology has a countable basis, and R × R with the standard topology has a countable basis.Let β be a basis for a finite-dimensional inner product space. (a) Prove that if <x, z>= 0 for all z∈β, then x = 0 . (b) Prove that if <x, z>=<y, z>for all z ∈β, then x= y.