"subring." YourDictionary, n.d. Web. 23 June 2018. <http://www.yourdictionary.com/subring>.
subring. (n.d.). Retrieved June 23rd, 2018, from http://www.yourdictionary.com/subring
If the larger ring contains a multiplicative identity, certain authors also require that the identity also be contained in the subring.
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