[Avodah] prozbul

[Eli Turkel]

Rambam shemitta veyovel 9:16 says prozbul works only because
shemitta nowadays is derabban (note Raavad disagrees)

Tosafot and Rama also learn that Rava's answer (hefker bet din) does
not help cancel shemitta because a court would never cancel a Torah mitzvah

BTW on
http://www.halachayomit.co.il/Pruzbul.asp
you can make the bet din a shliach for the prozbul without any witnesses on
the internet transaction.
The standard prozbul done in the local towns do have 2 witnesses signing

-- 
Eli Turkel