- #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.