Machine Learning, Data Science, Artificial Intelligence.
rational numbers (ℚ) within the real numbers (ℝ), the closure of ℚ is the entire set of real numbers (ℝ). If the closure of A is the same as A, A is a closed set. Both the empty set ∅ and the entire set X are considered both open and closed. Example Consider the open interval 𝐴 = (3, 6) on the real