Question: 4. Show that every open set in R is the union of countably many open intervals with rational endpoints 4. Show that every open set

4. Show that every open set in IR is the union of
countably many open intervals with rational endpoints.

4. Show that every open set in R is the union of countably many open intervals with rational endpoints

4. Show that every open set in IR is the union of countably many open intervals with rational endpoints.

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