Definition:Ring (Abstract Algebra)/Ring Less Zero
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Definition
Let $\struct {R, *, \circ}$ be a ring whose zero is $0$.
It is convenient to have a symbol for $R \setminus \set 0$, that is, the set of all elements of the ring without the zero.
Thus we usually use:
- $R_{\ne 0} = R \setminus \set 0$
Also denoted as
Most sources use $R^*$ to denote the set of elements of a ring without the zero.
However, this is also used by some sources to mean the group of units of such a ring $R$.
Hence $\mathsf{Pr} \infty \mathsf{fWiki}$ prefers the more explicit notation $\R_{\ne 0}$.
Sources
- 1965: Seth Warner: Modern Algebra ... (previous) ... (next): Chapter $\text {IV}$: Rings and Fields: $21$. Rings and Integral Domains