Let R be an associative ring
with identity and X a set of noncommuting variables {xλ}λ∈Λ. Let R{X} be the
free associative algebra on X over R. Then S. Gersten has shown that if
K1R → K1R[t] is an isomorphism, where R[t] is the polynomial extension of R, then
K1R → K1R{X} is an isomorphism.
The purpose of this paper is to extend the result of Gersten to twisted free
associative algebras.
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