I am having trouble with this study question for my final:(adsbygoogle = window.adsbygoogle || []).push({});

A function from the real numbers to the real numbers is one to one on an interval I if it is strictly increasing on that interval.

I am not quite sure how to prove it, I know that the use of strictly increasing is important as far as if x1 < x2, then f(x1) < f(x2). A hint I was told to use is contradiction.

Any help please!!!

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# One to one function

**Physics Forums | Science Articles, Homework Help, Discussion**