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Suspension of a ring
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In algebra, more specifically in algebraic K-theory, the suspension ΣR of a ring R is given by Σ(R)=C(R)/M(R) where C(R) is the ring of all infinite matrices with coefficients in R having only finitely many nonzero elements in each row or column and M(R) is its ideal of matrices having only finitely many nonzero elements. It is an analog of suspension in topology.