The circles A and B represent sets. "Intersect" is represented by an

**upside down U**. The intersection is where the circles overlap. "Union" is represented by a right-side up**U**. The union is the entire area of both circles.Beside this, what is the U in interval notation?

Using

**Interval Notation**. If an endpoint is included, then use [ or ]. If not, then use ( or ). For example, the infinite**interval**containing all points greater than or equal to 6 is expressed [6,Inf). If the set includes more than one**interval**, they are joined using the**union**symbol**U**.What is the difference between a union and intersection?

14.4

**Union and intersection**(EMA7Z) The**union**of two sets is a new set that contains all of the elements that are**in**at least one of the two sets. The**intersection**of two sets is a new set that contains all of the elements that are**in**both sets. The**intersection**is written as A ∩ B or “ A and B ”.What is the upside down U in math?

Union and Intersection. We just saw how to join two sets using "Union" (and the symbol ∪). There is also "Intersection" which

**means**"has to be in both". Think "where**do**they overlap?". The Intersection symbol is an**upside down**"**U**" like this: ∩