# Excision in algebraic $K$ -theory revisited

@article{Tamme2018ExcisionIA, title={Excision in algebraic \$K\$ -theory revisited}, author={Georg Tamme}, journal={Compositio Mathematica}, year={2018}, volume={154}, pages={1801 - 1814} }

By a theorem of Suslin, a Tor-unital (not necessarily unital) ring satisfies excision in algebraic $K$ -theory. We give a new and direct proof of Suslin’s result based on an exact sequence of categories of perfect modules. In fact, we prove a more general descent result for a pullback square of ring spectra and any localizing invariant. Our descent theorem contains not only Suslin’s result, but also Nisnevich descent of algebraic $K$ -theory for affine schemes as special cases. Moreover, the…

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