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what does closed under mean in math terms. In math its definition is that it is a complement of an open set. Mathematics in topological space a set that contains all its own limit points.
Similarly a set is said to be closed under a collection of operations. When 2x 4 then x 2 equivalence. Equal by definition approximately equal.
If you add one real number to another real number you get another real number.
Similarly a set is said to be closed under a collection of operations. Closed under addition means if you add any two members of the group together you get another member of the group rather than something else. Math and Algebra Help. Sin001 001 proportional to.