(a) Consider the following topology of X = {a,b, c, d, e}: T = {X, 0, {a}, {c, d}, {a, c, d}, {b, c, d, e}}. What are the components of X? (b) Show that every component E of X is closed.
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- Suppose f,g and h are all mappings of a set A into itself. a. Prove that if g is onto and fg=hg, then f=h. b. Prove that if f is one-to-one and fg=fh, then g=h.let (x,t) be a topological space prove that (x,t) is not connected if and only if there exist A,B belongs to t with x= A union B and A intersect B = zeroLet (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.
- I, Let ¥ ={a,b,c} and B={ {a,c} ,{b,.c} } c P(X). Show thatcannot be a base for any topology r on X . 2. Let (Vr) be a topological space. Where Y ={a,6 ,¢ ,d,e } andr={X .®,{c},{d}. {ed} .{d.e} .{e.d.e}, {b,c,a}, {a,b,c,d }}Show that f° ={ {c.d},{d,e},{a,b.c}} is a subbase for thetopology +r. 3. Let X ={a,b,c,d,e}, f° ={ {a,b} , {b,c} ,{c,e},fe} } o PX)Find the topology + on X generated by /".are R is not connected if T is the indiscrete topology? Or if T is the trivial topology? Or if T is the finite closed topology?let (X,T) be a topological space and A,B nonempty subsets of X with A∩Fr(B)=∅If A∩B≠∅ and A∩Bc≠∅ then show that A∩X\B̅≠∅ and A∩B̊≠∅
- If S is a closed bounded subset of a metric space X, then S is compact.For any infinite set X, the co-countable topology on X is defined to consist of all U in X so that either X\U is countable or U=0. Show that the co-countable topology satisfies the criteria for being a topology.Prove that in a metric space (S,d) every closed ball Sr[Xo] is a closed set
- Let X be an infinite set with the countable closed topology T={S subset of X :X_S is countable}. Then (X, T) is not connected?1. Let (M, d) be a compact metric space. Show that closed subsets of M are compact.Let T and T 'be two topologies of a set X.Is the family T U T´formed by the openings common to both also a topology of X?