In Set Theory: a set is closed under an operation if performance of that operation on members of the set always produces a member of the same set.
In Topology: a closed set is a set which contains all its limit points.
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The word power is another word for exponents
Its another word for subtracting one number from the other.
"And" usually refers to the process of addition. It can be another word for "plus."
the smallest numberIt means the smallest number
Edges are one dimensional objects where two planes meet.