What does $\mathbb{R}^ {\times}$ mean? I cannot seem to find it anywhere.
2026-03-27 01:43:55.1774575835
What does $\mathbb{R}^ {\times}$ mean?
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It is the set of the inversible elements of $\mathbb{R}$ considered as a ring. It is then $\mathbb{R}\setminus \{0\}$.