Answer to Question #40100 in Differential Geometry | Topology for Iman

Question #40100
let X={1,2,3}. The topology of X is the induced topology from the usual topology on the real line. Consider the product space X * [a,b], where a,b are real numbers. My question is classify all open sets and closed sets of X*[a,b]. what about 1*[a,b], is it open set?

thank you in advance
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