2. Consider R^1 and the set A = {x ? R^1 : 0 < x ? 1}. Describe Int(A), Ext(A), and Bd(A) if the topology on R^1 is the (a) Standard topology. (b) Left ray topology. (c) Discrete topology. (d) Indiscrete topology.
Added by Gerald T.
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(a) Standard topology: - Int(A) = (0,1) - Ext(A) = (-∞,0] ∪ [1,+∞) - Bd(A) = {0,1} Show more…
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