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subring

[suhb-ring]

sub·ring

[suhb-ring]
noun Mathematics.
a subset of a ring that is a subgroup under addition and that is closed under multiplication. Compare ring1 (def. 22).

Origin:
1950–55; sub- + ring1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Subring is always a great word to know.
So is coefficient. Does it mean:
a number or quantity placed before and multiplying another quantity, such as 3 in the expression 3x
a quantity of which a given quantity is the cube
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