Stage 19 · Sets & Intervals — the Language of Functions
19.5.1 A Range on the Number Line
19.5 Intervals and Neighborhoods: Sets on the Number Line
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19.5.1 A Range on the Number Line
Core ideaA continuous stretch of points on the number line is also a set, like {x | 1≤x≤5}.
Module goal. Carry the language of sets onto the number line, using intervals and neighborhoods to capture continuous ranges of numbers neatly — a direct route to the domain of a function