[Avodah] How does Prozbul work?

[Micha Berger via Avodah]

Li nir'eh the difference is that by eruv, it was all done in one sitting
of beis din -- when they assered a karmeelis, they also promulgated the
idea of eruv. IOW, explicitly they only assured a karmelis that didn't
have an eruv. (A conscious exemption more than a loophole, as I would
use the terms.)

Pruzbul was a loophole in an earlier taqanah and that was and promulgated
by a later beis di

GCT!
-Micha

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Micha Berger             Nearly all men can stand adversity,
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