Definition:Ring (Abstract Algebra)/Also known as
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Ring: Also known as
Earlier sources, that is, dating to the early $20$th century, refer to a ring as an annulus, but the word ring (at least in this context) is now generally ubiquitous.
- 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): annulus: 2.