Reed Collegepeople.reed.edu/~ormsbyk/DressNotes.pdfclasses 0t G—sets form a...
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Reed Collegepeople.reed.edu/~ormsbyk/DressNotes.pdfclasses 0t G—sets form a "half—ring" with Sum and "x" as product. be the corresponding Crothendieckring, the "Burns i deringn