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Subring - Wikipedia
Ring Theory/Subrings - Wikibooks, open books for an open world
ring theory - The subring test (subtraction vs. addition closure ...
Abstract Algebra 12.3: Subrings - YouTube
abstract algebra - Relationship between subrings and ideals ...
16.3: Rings - Mathematics LibreTexts
Search - 2.2: Rings - Mathematics LibreTexts
Subring -- from Wolfram MathWorld
About the definition of subring - Mathematics Stack Exchange
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