5. Which among the sets below is open with respect to the lower-limit topology on R? (a) [2,00) (b) (-2,-2) (c) (-2,2 (d
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5. Which among the sets below is open with respect to the lower-limit topology on R? (a) [2,00) (b) (-2,-2) (c) (-2,2 (d) R \{2} 6. In an infinite topological space (X, I), every singleton is an open set. Which of the following is necessarily true? (a) I is the discrete topology on X. (c) I has a finite basis. (b) I is the indiscrete topology on X (d) I has no basis.