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Counterexamples in Topology
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==List of mentioned counterexamples== {{div col|colwidth=30em}} #[[finite set|Finite]] [[discrete topology]] #[[Countable]] [[discrete topology]] #Uncountable [[discrete topology]] #[[Indiscrete topology]] #[[Partition topology]] #[[Odd–even topology]] #[[Deleted integer topology]] #[[Particular point topology|Finite particular point topology]] #[[Particular point topology|Countable particular point topology]] #[[Particular point topology|Uncountable particular point topology]] #[[Sierpiński space]], see also [[particular point topology]] #[[Closed extension topology]] #Finite [[excluded point topology]] #Countable [[excluded point topology]] #Uncountable [[excluded point topology]] #[[Open extension topology]] #[[Either-or topology]] #[[Finite complement topology]] on a [[countable]] space #[[Finite complement topology]] on an uncountable space #[[Countable complement topology]] #Double pointed [[countable complement topology]] #[[Compact complement topology]] #Countable [[Fort space]] #Uncountable [[Fort space]] #[[Fortissimo space]] #[[Arens–Fort space]] #Modified [[Fort space]] #[[Euclidean space|Euclidean topology]] #[[Cantor set]] #[[Rational number]]s #[[Irrational number]]s #Special subsets of the real line #Special subsets of the plane #[[One point compactification]] topology #One point compactification of the rationals #[[Hilbert space]] #[[Fréchet space]] #[[Hilbert cube]] #[[Order topology]] #Open ordinal space [0,Γ) where Γ<Ω #Closed ordinal space [0,Γ] where Γ<Ω #Open ordinal space [0,Ω) #Closed ordinal space [0,Ω] #Uncountable discrete ordinal space #[[Long line (topology)|Long line]] #[[Long line (topology)|Extended long line]] #An altered [[Long line (topology)|long line]] #[[Lexicographic order topology on the unit square]] #[[Order topology|Right order topology]] #[[Order topology|Right order topology on '''R''']] #[[Lower limit topology|Right half-open interval topology]] #[[Nested interval topology]] #[[Overlapping interval topology]] #[[Interlocking interval topology]] #Hjalmar Ekdal topology, whose name was introduced in this book. #[[Prime ideal topology]] #[[Divisor topology]] #[[Evenly spaced integer topology]] #The [[P-adic#Analytic approach|''p''-adic topology]] on '''Z''' #Relatively [[prime integer topology]] #[[Prime integer topology]] #Double pointed reals #Countable complement extension topology #[[K-topology|Smirnov's deleted sequence topology]] #[[Rational sequence topology]] #Indiscrete rational extension of '''R''' #Indiscrete irrational extension of '''R''' #Pointed rational extension of '''R''' #Pointed irrational extension of '''R''' #Discrete rational extension of '''R''' #Discrete irrational extension of '''R''' #Rational extension in the plane #[[Telophase topology]] #[[Double origin topology]] # [[Irrational slope topology]] #Deleted diameter topology #Deleted radius topology #[[Half-disk topology]] #Irregular lattice topology #[[Arens square]] #Simplified [[Arens square]] #[[Moore plane|Niemytzki's tangent disk topology]] #Metrizable tangent disk topology #[[Sorgenfrey plane|Sorgenfrey's half-open square topology]] #Michael's product topology #[[Tychonoff plank]] #[[Deleted Tychonoff plank]] #[[Alexandroff plank]] #[[Dieudonné plank]] #Tychonoff corkscrew #Deleted Tychonoff corkscrew #[[Hewitt's condensed corkscrew]] #[[Thomas's plank]] #[[Thomas's corkscrew]] #[[Split interval|Weak parallel line topology]] #Strong parallel line topology #Concentric circles #[[Appert space]] #Maximal compact topology #Minimal [[Hausdorff topology]] #[[Alexandroff square]] #'''Z<sup>Z</sup>''' #Uncountable products of '''Z'''<sup>+</sup> #Baire product metric on '''R'''<sup>ω</sup> #'''I<sup>I</sup>''' #[0,Ω)×'''I<sup>I</sup>''' #[[Helly space]] #'''C'''[0,1] #[[Box topology|Box product topology]] on '''R'''<sup>ω</sup> #[[Stone–Čech compactification]] #[[Stone–Čech compactification]] of the integers #[[Novak space]] #Strong ultrafilter topology #Single ultrafilter topology #Nested rectangles #[[Topologist's sine curve]] #[[Topologist's sine curve|Closed topologist's sine curve]] #[[Topologist's sine curve|Extended topologist's sine curve]] #[[Infinite broom]] #[[Closed infinite broom]] #[[Integer broom]] #Nested angles #Infinite cage #[[Bernstein's connected sets]] #[[Gustin's sequence space]] #[[Roy's lattice space]] #[[Roy's lattice subspace]] #[[Knaster-Kuratowski fan|Cantor's leaky tent]] #[[Cantor's teepee]] #[[Pseudo-arc]] #[[Miller's biconnected set]] #Wheel without its hub #[[Tangora's connected space]] #Bounded metrics #[[Sierpinski's metric space]] #[[Duncan's space]] #[[Cauchy completion]] #[[Hausdorff distance|Hausdorff's metric]] topology #[[Post Office metric]] #Radial metric #Radial interval topology #[[Bing's discrete extension space]] #[[Michael's closed subspace]] {{div col end}}
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