1 Department of Physics, Faculty of Science, Tokyo University of Science, Tokyo, Japan. 2 Department of Physics, University at Buffalo, State University of New York, Buffalo, NY, USA. Indeed, the band ...
$$\real^{+}$$; the set of non-negative real numbers. $$(\real^n, \real^n) \rightarrow \real^+$$; a function that takes two vectors of dimension $n$ and returns a non ...