A null set.
Yes.
It's called an infinite set.
I believe you are talking about subsets. The empty set (set with no elements) is a subset of any set, including of the empty set. ("If an object is an element of set A, then it is also an element of set B." Since no element is an element of set A, the statement is vacuously true.)
The Real line.
An invisible, undefined set!
A set is not an operation.
A null set.
Trips is another way of saing three of a kind.
what education do you need to be a set desinger
Yes.
They have a DW drum set for most of there concerts.
Set was the Egyptian god of storms, the desert, and chaos.
It's called an infinite set.
Set of integers.
A singular common noun
which kind of noun is set