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- 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 ].Let f:AA, where A is nonempty. Prove that f a has right inverse if and only if f(f1(T))=T for every subset T of A.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: .
- Prove Theorem 1.40: If is an equivalence relation on the nonempty set , then the distinct equivalence classes of form a partition of .23. Let be the equivalence relation on defined by if and only if there exists an element in such that .If , find , the equivalence class containing.Prove the Theorem 5.5.7 - Let (X1, d1) and (X2, d2) be metric spaces and let f : X1 → X2. Then f is continuous on X1 iff f-1 (G) is an open set in X1 whenever G is an open set in X2.
- In a finite dimensional normed linear space X, any subset M is compact if and only if M is closed and bounded.Let (X,τ) is a topological space and A ⊆ X. If all subsets of A are closed in X, then set A cannot have a limit point.Let (S,≼) be a linearly ordered set with the Least-Upper-Bound Property. Let A and B be non-empty and bounded below subsets of S. (i) Prove that A ∪ B is bounded below in S.(ii) Prove that inf(A ∪ B) ≼ inf(A) by using the definition of the infimum of a set in S.
- Let (X, τ1) be any topological space and (X, τf ) be the finite complement topological space.Show that the space (X, τ1) is a T1−space if and only if τf ⊆ τ1.Give an example of a set X and topologies T1 and T2 on X such that T1 union T2 is not a topology on XLet (X,d) be a metric space , x ϵ X and A ⊑ X be a nonempy set. Prove that d (x ,A) = 0 if and only if every neighborhood of x contains a point of A.