1.- Show that T4 = ⇒ T31 = ⇒ T3 =⇒ T2 = ⇒ T1 =⇒ T0.
14. Give examples of: (a) A topological space that is T0 but not T1. (b) A topological space that is T1 but not T2. (c) A topological space that is T2 but not T3.
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