Grothendieck group of a ring

accept by way of security acridotheres tristis tristis air risks antilithics aspen poplar aurora yellow bothriomyrmex wroughtoni formosensis combination cargo-passenger ship direct-current restorer flowmetries go-gettings hybrid incapacity incipient fluidized bed leukoerythroblastic microstructure of material monochromatism morn. person of interest Segari skin area