Before revision: We generalize the fundamental theorem of asset pricing (FTAP) and hedging dualities in \mbox{%DIFAUXCMD ZZ8 the case where the investor can  short American options.
After revision: We generalize the fundamental theorem of asset pricing (FTAP) and hedging dualities in \mbox{%DIFAUXCMD ZZ8 the case where the investor can also short American options.