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In mathematics a set of functions S from a set D to a set C is called a separating set for D or said to separate the points of D if for any two distinct elements x and y of D, there exists a function f in S so that f(x) ≠ f(y).
- If X is a normal topological space, then Urysohn's lemma states that the set C(X) of continuous functions on X with real (or complex) values separates points on X.
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