Prove the following: theorem: every topological group is completely regular. Proof. Let V0 be a neighborhood...

Prove the following: theorem: every topological group is completely regular. Proof. Let V0 be a neighborhood of the identity elemetn e, in the topological group G. In general, coose Vn to be a neighborhood of e such that Vn.VncVn-1. Consider the set of all dyadic rationals p, that is all ratinal number of the form k/sn, with k and n inegers. FOr each dyadic rational p in (0,1], define an open set U(p) inductively as foloows: U(1)=V0 and

Expert Solution

Colby Messinger answered 2 years ago

Prove whether the following are regular (include the file) or not regular (attach a proof). The...

Prove whether the following are regular (include the file) or not regular (attach a proof). The alphabet is {0, 1}. 1. The set of strings that start with N 0's which are directly followed by 2N 1's. 2. The set of strings start with two 0's, followed by N 1's, followed by N 1's and end with three 0's. 3. The set of strings where every substring of length 5 has more 0's than 1's. Strings less than length five...

The goal of this exercise is to prove the following theorem in several steps. Theorem: Let...

The goal of this exercise is to prove the following theorem in several steps. Theorem: Let ? and ? be natural numbers. Then, there exist unique integers ? and ? such that ? = ?? + ? and 0 ≤ ? < ?. Recall: that ? is called the quotient and ? the remainder of the division of ? by ?. (a) Let ?, ? ∈ Z with 0 ≤ ? < ?. Prove that ? divides ? if and...

1.- let(X1, τ1) and (X2, τ2) are two compact topological spaces. Prove that their topological product...

1.- let(X1, τ1) and (X2, τ2) are two compact topological spaces. Prove that their topological product is also compact. 2.- Let f: X - → Y be a continuous transformation, where X is compact and Y is Hausdorff. Show that if f is bijective then f is a homeomorphism.

Prove the following more general version of the Chinese Remainder Theorem: Theorem. Let m1, . ....

Prove the following more general version of the Chinese Remainder Theorem: Theorem. Let m1, . . . , mN ∈ N, and let M = lcm(m1, . . . , mN ) be their least common multiple. Let a1, . . . , aN ∈ Z, and consider the system of simultaneous congruence equations    x ≡ a1 mod m1 . . . x ≡ aN mod mN This system is solvable for x ∈ Z if and...

Prove that the following two statements are not logically equivalent. In your proof, completely justify your...

Prove that the following two statements are not logically equivalent. In your proof, completely justify your answer. (a) A real number is less than 1 only if its reciprocal is greater than 1. (b) Having a reciprocal greater than 1 is a sufficient condition for a real number to be less than 1. Proof: #2. Prove that the following is a valid argument: All real numbers have nonnegative squares. The number i has a negative square. Therefore, the...

Let X, Y be two topological spaces. Prove that if both are T1 or T2 then...

Let X, Y be two topological spaces. Prove that if both are T1 or T2 then X × Y is the same in the product topology. Prove or find a counterexample for T0.

b）Prove that every metric space is a topological space. (c) Is the converse of part (b)...

b）Prove that every metric space is a topological space. (c) Is the converse of part (b) true? That is, is every topological space a metric space? Justify your answer

Use Myhill-Nerode Theorem to prove the following languages are not regular A1 = {0n1n2n| n >=...

Use Myhill-Nerode Theorem to prove the following languages are not regular A1 = {0n1n2n| n >= 0} A2 = {www| w E {a, b}*}

Prove the theorem in the lecture:Euclidean Domains and UFD's Let F be a field, and let...

Prove the theorem in the lecture:Euclidean Domains and UFD's Let F be a field, and let p(x) in F[x]. Prove that (p(x)) is a maximal ideal in F[x] if and only if p(x) is irreducible over F.

Bezout’s Theorem and the Fundamental Theorem of Arithmetic 1. Let a, b, c ∈ Z. Prove...

Bezout’s Theorem and the Fundamental Theorem of Arithmetic 1. Let a, b, c ∈ Z. Prove that c = ma + nb for some m, n ∈ Z if and only if gcd(a, b)|c. 2. Prove that if c|ab and gcd(a, c) = 1, then c|b. 3. Prove that for all a, b ∈ Z not both zero, gcd(a, b) = 1 if and only if a and b have no prime factors in common.

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