Gittin 28: Schrodinger's Get

When a shaliach brings a get from the husband to the wife, the assumption is that status quo ante - the husband is presumed to remain alive, and other similar conditions (eg, one's right to eat terumah). Plus, a key dispute that reflects personal approach, within the debate. Plus, why only men did semicha (laying on if hands) for the sin-offering, and women did not. [Who's Who: R. Yehudah ben Prata] Also, different cases, including a besieged town and a ship at sea... when does one presume the person there is alive or did, or get the stringencies of both cases?