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 [tex]\mathbb{R^+_*}[/tex]. 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?(adsbygoogle = window.adsbygoogle || []).push({});

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# Notation issues

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