Topology
2nd Edition
ISBN: 9780134689517
Author: Munkres, James R.
Publisher: Pearson,
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Chapter 2.19, Problem 3E
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Chapter 2 Solutions
Topology
Ch. 2.13 - Prob. 1ECh. 2.13 - Consider the nine topologies on the set X=a,b,c...Ch. 2.13 - Show that the collection Tc given in Example 4 of...Ch. 2.13 - a If {T} is a family of topologies on X, show that...Ch. 2.13 - Show that if A is a basis for a topology on X,...Ch. 2.13 - Show that the topologies of l and K are not...Ch. 2.13 - Consider the following topologies on : T1 = the...Ch. 2.13 - a Apply Lemma 13.2 to show that the countable...Ch. 2.16 - Show that if Y is a subspace of X, and A is a...Ch. 2.16 - If and are topologies on X and is strictly...
Ch. 2.16 - Consider the set Y=[1,1] as a subspace of .Which...Ch. 2.16 - A map f:XY is said to be an open map if for every...Ch. 2.16 - Let X and X denote a single set in the topologies ...Ch. 2.16 - Exercises Show that the countable collection...Ch. 2.16 - Prob. 7ECh. 2.16 - Exercises If L is a straight line in the plane,...Ch. 2.16 - Exercises Show that the dictionary order topology...Ch. 2.16 - Exercises Let I=[0,1]. Compare the product...Ch. 2.17 - Let C be a collection of subsets of the set X....Ch. 2.17 - Show that if A is closed in Y and Y is closed in...Ch. 2.17 - Show that if A is closed in X and B is closed in...Ch. 2.17 - Show that if U is open in X and A is closed in X,...Ch. 2.17 - Let X be an ordered set in the order topology....Ch. 2.17 - Prob. 6.1ECh. 2.17 - Prob. 6.2ECh. 2.17 - Let A, B, and A denote subsets of a space X. Prove...Ch. 2.17 - Prob. 7ECh. 2.17 - Let A, B, and A denote subsets of a space X....Ch. 2.17 - Let A, B, and A denote subsets of a space X....Ch. 2.17 - Let A, B, and A denote subsets of a space X....Ch. 2.17 - Let AX and BY. Show that in the space XY, AB=AB.Ch. 2.17 - Show that every order topology is Hausdorff.Ch. 2.17 - Show that the product of two Hausdorff spaces is...Ch. 2.17 - Show that a subspace of a Hausdorff space is...Ch. 2.17 - Show that X is Hausdorff if and only if the...Ch. 2.17 - Prob. 14ECh. 2.17 - Show the T1 axiom is equivalent to the condition...Ch. 2.17 - Prob. 16.1ECh. 2.17 - Consider the five topologies on given in Exercise...Ch. 2.17 - Consider the lower limit topology on and the...Ch. 2.17 - Prob. 19ECh. 2.18 - Prove that for functions f:, the definition of...Ch. 2.18 - Prob. 2ECh. 2.18 - Let X and X denote a single set in the two...Ch. 2.18 - Let X and X denote a single set in the two...Ch. 2.18 - Given x0X and y0Y, show that the maps f:XXY and...Ch. 2.18 - Show that subspace (a,b) of is homeomorphic with...Ch. 2.18 - Prob. 6ECh. 2.18 - (a) Suppose that f: is continuous from the right,...Ch. 2.18 - Let Y be an ordered set in the order topology. Let...Ch. 2.18 - Let {A} be a collection of subsets of X; let X=A....Ch. 2.18 - Let f:AB and g:CD be continuous functions. Let us...Ch. 2.18 - Prob. 11ECh. 2.19 - Prove Theorem 19.2. Theorem 19.2. Suppose the...Ch. 2.19 - Prove Theorem 19.3. Theorem 19.3. Let A be a...Ch. 2.19 - Prove Theorem 19.4. Theorem 19.4. If each space X...Ch. 2.19 - Show that (X1Xn1)Xn is homeomorphic with X1Xn.Ch. 2.19 - One of the implications stated in Theorem 19.6...Ch. 2.19 - Let be the subset of consisting of all sequences...Ch. 2.19 - Given sequences (a1,a2,...) and (b1,b2,...) of...Ch. 2.19 - Show that the choice axiom is equivalent to the...
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- Complete the proof of Theorem 5.30 by providing the following statements, where and are arbitrary elements of and ordered integral domain. If and, then. One and only one of the following statements is true: . Theorem 5.30 Properties of Suppose that is an ordered integral domain. The relation has the following properties, whereand are arbitrary elements of. If then. If and then. If and then. One and only one of the following statements is true: .arrow_forwardTake this test to review the material in Chapters 4 and 5. After you are finished, check your work against the answers in the back of the book. Prove that the set of all singular 33 matrices is not a vector space.arrow_forwardDetermine whether the set R2 with the operations (x1,y1)+(x2,y2)=(x1x2,y1y2) and c(x1,y1)=(cx1,cy1) is a vector space. If it is, verify each vector space axiom; if it is not, state all vector space axioms that fail.arrow_forward
- Prove statement d of Theorem 3.9: If G is abelian, (xy)n=xnyn for all integers n.arrow_forwardProve that the cancellation law for multiplication holds in Z. That is, if xy=xz and x0, then y=z.arrow_forwardLabel each of the following statements as either true or false. A mapping is onto if and only if its codomain and range are equal.arrow_forward
- Describe the kernel of epimorphism in Exercise 20. Consider the mapping :Z[ x ]Zk[ x ] defined by (a0+a1x++anxn)=[ a0 ]+[ a1 ]x++[ an ]xn, where [ ai ] denotes the congruence class of Zk that contains ai. Prove that is an epimorphism from Z[ x ] to Zk[ x ].arrow_forward8. a. Prove that the set of all onto mappings from to is closed under composition of mappings. b. Prove that the set of all one-to-one mappings from to is closed under composition of mappings.arrow_forwardConsider the mapping :Z[ x ]Zk[ x ] defined by (a0+a1x++anxn)=[ a0 ]+[ a1 ]x++[ an ]xn, where [ ai ] denotes the congruence class of Zk that contains ai. Prove that is an epimorphism from Z[ x ] to Zk[ x ].arrow_forward
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