A set that has no element is called empty set and is denoted by or. The value of this is the same as fixedscientific defaultfloat. X x 2 or x 3 On the Number Line it looks like.
For example y 2x 3 is my favorite linear function.
Of course x here represents the sheep. Most students will be introduced to function notation after studying linear functions for a little while. A 3 In sets B and C we have more than one member. The symbol in between the two sets is the union symbol and means that the solution can belong to either interval.