- #1

heshbon

- 27

- 0

## Homework Statement

Let I C

**R**be an interval which is open and closed at the same time. Prove that I=

**R**or I is the empty set.

## Homework Equations

## The Attempt at a Solution

I'm looking more for a outline structure for the solution. I have made assumptions that I is not equal to R seeking a contradition, but i don't know what further assumptions to make.