# Homework Help: Generalized uncertainty principle

1. Mar 31, 2010

### usphys

So I'm working on the proof of the generalized uncertainty principle and there is a step that I'm not fully understanding. There is a line were it says that for any complex number we can write the inequality as [Re(z)]^2 + [Im(z)]^2 >/ [Im(z)]^2. why are we able to get rid of the real part on the left hand side?

Does this have anything to do with the magnitude being greater than the magnitude of the imaginary part?

Last edited: Mar 31, 2010
2. Mar 31, 2010

### gabbagabbahey

Both $\text{Re}[z]$ and $\text{Im}[z]$ are real numbers. When you square them you will get positive numbers (or zero). When you add two positive numbers together, you definitely get a number that is larger than either of the two.

3. Mar 31, 2010

### usphys

is it correct to assume that there is an observable violation in removing the real part and that is why it is greater than or equal to just the imaginary?