Subring

A subring of a ring R is a subgroup of R that is closed under multiplication.

See also

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References

Dummit, D. S. and Foote, R. M. "Basic Definitions and Examples." §7.1 in Abstract Algebra, 3rd ed. Hoboken, NJ: Wiley, pp. 223-232, 2004.

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Weisstein, Eric W. "Subring." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Subring.html

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