# Notation issues

1. Apr 9, 2005

### Lonewolf

I'm trying to read 'Wavelets on the 2-Sphere: A Group Theoretical Approach' by Antoine and Vanderghynst, available at http://citeseer.ist.psu.edu/antoine98wavelets.html. They introduce $$\mathbb{R^+_*}$$. Unfortunately, they don't seem to define this anywhere in the paper, and I've never come across such notation before. Anybody got any ideas?

2. Apr 9, 2005

### quasar987

Could it mean "positive reals excluding zero" ?

When I was in elementary school, this was what the author of our textbook had it mean (as far as i can remember).

3. Apr 9, 2005

### Lonewolf

That makes sense in the context :) thanks