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Aug 11, 2014 at 19:49 vote accept Hugo Chapdelaine
Aug 11, 2014 at 19:19 comment added Felipe Voloch @HugoChapdelaine Yes.
Aug 11, 2014 at 19:16 comment added Hugo Chapdelaine So if we think of $T:C\rightarrow C$ as a multivalued function and $T(P)=\sum_{i} [P_i]$ (formal sum) then are you saying that $(-T)(P)=\sum_{i} [-P_i]$?
Aug 11, 2014 at 18:54 history answered Felipe Voloch CC BY-SA 3.0