Gittin 15: The Writing and the Signing

One who brings a bill of divorce from overseas, as a shaliach - various ways the get will end up invalid. With the attendant disputes and resolutions, including protecting other documents from a leniency that applies only in the case of divorce. Also, borrowing from other halakhic areas: how arenas combine or divide with legal partitions, as per eruvin. To what extent can the different arenas allow various parts of a scenario to combine.