Which of the following is true: Every bounded subset of (R, Tusuat) is compact. Every closed subset of (R, Tusual ) is compact. Every compact subset of T2-Space is clopen. Every closed subset of (R, TCOF ) is compact.
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- Suppose thatis an onto mapping from to. Prove that if ℒ, is a partition of, then ℒ, is a partition of.Label each of the following statements as either true or false. Every upper bound of a nonempty set is a least upper bound.Label each of the following statements as either true or false. Every endomorphism is an epimorphism.
- Label each of the following statements as either true or false. The least upper bound of a nonempty set S is unique.Label each of the following statements as either true or false. The Well-Ordering Theorem implies that the set of even integers contains a least element.Label each of the following statements as either true or false. Every least upper bound of a nonempty set S is an upper bound.
- A relation R on a nonempty set A is called asymmetric if, for x and y in A, xRy implies yRx. Which of the relations in Exercise 2 areasymmetric? In each of the following parts, a relation R is defined on the set of all integers. Determine in each case whether or not R is reflexive, symmetric, or transitive. Justify your answers. a. xRy if and only if x=2y. b. xRy if and only if x=y. c. xRy if and only if y=xk for some k in . d. xRy if and only if xy. e. xRy if and only if xy. f. xRy if and only if x=|y|. g. xRy if and only if |x||y+1|. h. xRy if and only if xy i. xRy if and only if xy j. xRy if and only if |xy|=1. k. xRy if and only if |xy|1.29. Suppose , , represents a partition of the nonempty set A. Define R on A by if and only if there is a subset such that . Prove that R is an equivalence relation on A and that the equivalence classes of R are the subsets .13. Consider the set of all nonempty subsets of . Determine whether the given relation on is reflexive, symmetric or transitive. Justify your answers. a. if and only if is subset of . b. if and only if is a proper subset of . c. if and only if and have the same number of elements.
- Label each of the following statements as either true or false. If a nonempty set contains an upper bound, then a least upper bound must exist in .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 ].21. A relation on a nonempty set is called irreflexive if for all. Which of the relations in Exercise 2 are irreflexive? 2. In each of the following parts, a relation is defined on the set of all integers. Determine in each case whether or not is reflexive, symmetric, or transitive. Justify your answers. a. if and only if b. if and only if c. if and only if for some in . d. if and only if e. if and only if f. if and only if g. if and only if h. if and only if i. if and only if j. if and only if. k. if and only if.