# Lorentz- Relativity

1. Jan 25, 2007

### Gyroscope

It's just a simple question.
In the Lorentz Transformations what means the variable $\bold \tau$?

Thanks, I am deducing this transformations for coordinates, but now I come for this $\bold \tau$ and I cannot deduce if I don't know what it is.

2. Jan 25, 2007

### MeJennifer

In principle a variable can stand for anything, but it is conventional in relativity for it to stand for the proper time interval, that is the time interval as measured in the local restframe.

3. Jan 26, 2007

### Gyroscope

Yes, it stands for time.
Is it too difficult for an high school student to derive the Lorentz Transformation for time? For x it was very easy. But I am having problems with time.