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