National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Closure
Dr. Math explains the algebraic concept of closure. Dr. Math gives several examples and explains why the set is closed under the operation or not.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Faq: Closure
This site explains closure and has a link to a response from Dr. math regarding this topic. The site explains why the real numbers are closed under the operation of multiplication. The site gives an example of an operation which the real...