: Mathematics: Steinberg group

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Steinberg group

In algebraic K-theory, a field of mathematics, the Steinberg group ${\\displaystyle \\operatorname {St} (A)}$ of a ring ${\\displaystyle A}$ is the universal central extension of the commutator subgroup of the stable general linear group of ${\\displaystyle A}$ .
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Steinberg_group_(K-theory))

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