Did you mean set builder notation? It's written like this.
Example: Even number greater than 2 but less than 0.
Set A= {x|x is an even number greater than two but less than 20}
I hate Math. I really do. >:|
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a builder notation is like this < x/x is a set of nos. up to 7>
describing of one object
i don't knoww
x|x is the letter of monkey
{x| x is the name of day of week}