1) If a and b are given integers, not both zero,show that the set T {ax+by: x,y are integers} is the iset of al1 multiples of d = acd (a,b)

Q: &2/ suppost se =20, 1} and c={208{ fie ld =20,18 and e= Enumerate the class of all 6- Containing C…

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Q: Let (A, 3) be a poset, and let BC A. Prove that B has at most one greatest lower bound.

A: Let, A,<~ be a poset and B is a subset of A and a∈A. Then by the definition, a is the greatest…

Q: For two R-modules Mand N Show that Hom (M,N) any with the composition is not agroup?

A: Given that M and N are two R-modules. We have to show that HomM,N is not a group under composition.…

Q: 6. Prove that if gcd(a , b) = 1, then gcd(a + b, ab) = 1.

A: We need to prove that if gcda,b=1 then gcda+b,ab=1 Let us on the contrary assume that  gcda+b,ab=c…

Q: Q) prove that aset A is non denumerable iland only if AxAXA is nondenumerable

A: In this question, we have to show that a set A is non denumerable if and only if A×A×A is non…

Q: Suppose A and B are bounded and nonempty subsets of real numbers and 1 E R. In this case: sup(A U B)…

A: Let A,B not empty, bounded subsets of R .Prove thatsup(A∪B)=max{sup(A),sup(B)}. Let: ⇒x∈A∪B⇒x∈A or…

Q: 3. Find the number that provides a counterexample to show that the given statement is false. a) For…

A: Hi, thank you for the question. Since you have posted multiple questions with multiple sub-parts, as…

Q: Show that (A, <) is a poset. (Hint: While showing antisymmetry and transitivity, you may need to…

A: As per guidelines, we will solve first question only. Given A=1,2,3,4,6,8,9,12. Consider a relation…

Q: Consider the set T = {..., −34, −17, 0, 17, 34, ... } with the usual definition of less than (a0).…

A: Completeness property of real numbers:  Every non-empty set of real numbers that has an upper bound…

Q: 5. Let r € R and A, = {q € Q : q < x} . Prove sup A, = x.

A: According to the given information, Consider the given set Ax:

Q: 10. Two sets are called disjoint if they have no elements in common, i.e., if their intersection is…

A: Note that two sets are called disjoint if they have no elements in common, that is, if their…

Q: السؤال 12 Let T-{1,33. 1 1 1 .}, then T is countably infinite set. 2 in صواب ihi

A: We Know that We say a set X is countably infinite if |X| = |N| where N is set of Natural Numbers.

Q: Let S be any set of non-negative integers with k + 1 elements. Show that there is x, Y E S s.t. k…

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Q: Let D be digraph. If id(x) > 0 for all x ∈ V (D), then D contains a circuit.

A: Given:- Let D be digraph. If id(x) &gt; 0 for all x ∈ V (D)

Q: Prove by contrapositive. if x and y are integers such that x > 1, and x divides y, then x / (y +1)

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Q: Let a and b be integers, not both 0. Show that there are infinitely many pairs s,t of integers such…

A: We will first show that  there are infinitely many pairs s,t of  integers such that :as+bt=0 Now, we…

Q: (4.2) Let X = {1,2, 3, 4} and 7 = {0, {1,2,3} , {2, 3},{1},X} be the topology defined on X. (a) Show…

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Q: The linear congruence ax = b(mod m) has a unique solutionif and onlyif: gcd(a,b)= 1 gcd(a,m) #1 O…

A: Gcd(a,m)=1

Q: If all entries of A and A -1 are integers, prove that &lt;let A = 1 or -1. Hint: What is det A times…

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Q: If a1, az, az,.-ans. be the A.P. and S, = a-1m+1+a-1m+2+a-1n+3 +.--+ am %3D Prove that :…

A: In this question we have to proof S1, S2, S3,.... are in Arithmetic Progression.

Q: Let a and b be positive integers such that ax + by = 7 for some integers x and y. Then %3D

A: We have to choose  current answer of given statement.

Q: (5) Show that for any real number x and a subset A of R, exactly one of the following holds: (a) x…

A: To prove: If x is any real number and any subset A of ℝ, then either x is an interior point of A or…

Q: Suppose A1, A2, ..., 430 are thirty sets each having 5 elements and B₁, B2, ..., B₁ are n sets each…

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Q: 1. Prove with the resolution calculus -(PA-Q) -P (RAS) VQ

A: To prove with resolution calculus: ¬P∧¬Q         ¬¬P__________R∧S∨Q

Q: 4. Show that if x, y, z are integers such that x2 + y2 + z? = 2xyz, then x = y = z = 0. (H)

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Q: #3. Let n be an mteg er with nz1 and Let b., bzba be ... positive real nmmbers, not all egual, such…

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Q: Show that gcd(a,n)=1 if these exist m and k such that ma+nk = 1.

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Q: 4.4 Find a set of 3 points in S' so that dcos does not satisfy the triangle inequality.

A: Please check step 2 for the solution.!

Q: Let a, b, c, d, e, and f be positive integers. Let d = gcd(a, b, c), e = gcd(a, b) and f = gcd(e,…

A: Given that for positive integers a,b,c,d,e,f , d=gcda,b,ce=gcda,bf=gcde,c

Q: Prove from fundamental definitions and principles, that (-00, 0] and (0, 4] are numerically…

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Q: *3. Suppose x is a real number and > 0. Prove that (x - e, x + e) is a neighborhood of each of its…

A: Given that 'x' is a real number and ε&gt;0. To prove that x-ε, x+ε is a neighborhood of each of its…

Q: Consider the set Q = Z ×(Z 10), and the relation tupon QDefined as: (a, b) ↑ (c, d) a•d = b•c d)…

A: Answer is mentioned below

Q: The supremum of the set S={1- (-1)". :neN is a) 1 b) 0 c) п d) 2

A: The given set is  S=1--1nn:n∈ℕ The elements of the set can be listed by putting different values of…

Q: If geRla,b] and if h(w)= gcu) encept %D finite number f points for [a, b],'then and in of prove that…

A: First we have to divide the set into finite subsets of x intervals required.

Q: 3. Suppose (a,n) is Cauchy and that for all m, k 2 100, Jam - as 0. Does it follow that the…

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Q: 4. Demonstrate that for positive integers t and Q, (t <= [V@]) is equivalent to (t x t <= Q). Show…

A: Given that t and Q are two positive integers and t≤Q To show that t×t≤Q Since from the given…

Q: Let a1, a2, a3, . .., an be real numbers. Prove that at least one of them is greater than the…

A: We prove it by contradiction.

Q: 1. Suppose A, B, and C are sets, A. Prove that: AX (Bn C) = (A X B) n (A x C) %3D

A: As per our guidelines we are supposed to answer only one question.Since you have asked multiple…

Q: 8. Prove that a matroid is uniform if and only if every circuit meets every cocircuit.

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Q: let 19, b) = 1, them prove that there exists x20 Such that ijzo ax_by = 1

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Q: 1. Prove or disprove that (pg)→r and p(q-r) are equivalent.

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Q: Suppose A and B are bounded and nonempty subsets of real numbers and 1 E R. In this case: sup(AB) =…

A: Suppose A and B are bounded and nonempty subsets of real numbers and λ∈R. We need to prove that…

Q: Let A1, A2, ... , An be any n sets, n 2 1. Show that (U-1 Ar) = U=1 Ar %3D

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Q: . Let A, B be sets of real numbers. We will say that B is dense in A if for any s e A and for any…

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Q: 12.42. Let a, be Z, where not both a and b are 0. Prove that if d = gcd(a, b), a = ajd and b = b1d,…

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Q: #3. Let n be an wi'th nzl and let b, bz ba be integer posikive real numbers, not all egual, such…

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Q: Suppose that a,beG such that a = m and b =n with Gcd (m,n) = 1. Then n | is in mn

A: Suppose that a, b∈G such that a=mb=n and Gcdm, n=1 i.e., m and n are relatively prime. We will find…

Q: Let a and b be integers, not both zero. Then a and b are relativelyprimeif and only if a)1 = ax +…

A: Option D will be the right answer.

Q: If A and B are points in 3-space then |AB| = |BÁ| Select one: O True O False

A: If A and B are point in 3-space then

Q: If A subut of B. where B 18 a closo d subset of IR show that

A: Given: A is a subset of B, where B is closed subset of ℝp. To show: A¯⊆B.