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Mathematics 17 Online
OpenStudy (anonymous):

what is a real number, empty set and no solution

Directrix (directrix):

A real number is any rational or irrational number. The empty set is a set with no elements. { } is a way to indicate that. No solution means that a problem has no answer. For example, if x = x + 1, solve for x. There is no solution to that equation.

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