We show that the relative algebraic K-theory group K2i(Z[x,y]/(xy),(x,y)) is free abelian of rank 1 and that K2i+1(Z[x,y]/(xy),(x,y)) is finite of order (i!)2. We also find the group structure of K2i+1(Z[x,y]/(xy),(x,y)) in low degrees.
Homology, Homotopy and Applications, Vol. 13 (2011), No. 2, pp.103-111.
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