IN Rav Shach Laws of Divorce 8. law 10.
Rav Shach brings an argument between the sages that came right after the Talmud [רבנן סבוראי][Savorai] [before the geonim] and the rishonim. The origin is the the very first book that compiled laws from the Talmud the "great halahot" [Halachot Gedolot] .
The issue is if one says to his wife, "Here is your "get" [divorce] if you do not drink wine all the days of So and So." Then some time later, the husband dies and then she drinks while so and so is still alive.
Is the get [divorce doc ] nullified? The Savorai רבנן סבוראי say "No." There is no nullification after death. The Halachot Gedolot and the Rishonim say the get is null and void based on a law that says one says to his wife, "This is your get [divorce] if you do not drink wine your whole life." That get [divorce] is null. But if the Savorai would be right, then it could happen that he would die and the get [divorce] would be valid. What's the difference? I would like to get into the debate that Rav Shach has there with the Shaagat Aryee [a friend of the Gra] and R. Akiva Eiger.
I thought about the difference when one says, "This will be your get [divorce] if you do or do not do such and such". The other case is when one says, "This will not be your get if you do or do not do such and such."] But that does not seem to help.
Rav Shach said a way to answer for the [רבנן סבוראי] Savorai sages would be to ask what the main thing the husband means. In one case he is not giving a time limit. He is just saying she should not drink wine. That makes her still attached to him, so the get is null. [The "get" has to be a complete separation in order to be valid]. But in the case of her not drinking in the time of so and so, there the main idea is to give a time limit when she can start again drinking. So there is a possibility of complete separation.
[When he gives to his wife the get on condition she never drinks wine, that has no time limit. So even if he dies in the middle, that is still infinity minus some number-- which is still infinity. But in the case of her not to drink during the life of so and so, that has a possible limit. That is the way I understand this. It is not exactly in Rav Shach but it seems to dovetail nicely with what he says. He makes the point of where the focus of the husband is. And in my view that itself depends on teh difference between "do not drink wine your whole life " [which means for her never], and "do not drink wine during the lifetime of so and so."
[The way that the Shaagat Aryee and R. Akiva Eiger answer for the Savorai is that there needs to be a positive fulfillment of the condition [not just passive] and that can not be after the death of the husband. Rav Shach notes at least two problems with that answer. [Which I really did understand. Mainly it looks to me that Rav Shach is simply saying that that "Hiluk" [an answer by making a distinction] does not seem to answer the question. ]
I just wanted to add that the story with the Savorai was that the yeshivot in Iraq [Babylonia] were closed by the government after there had been a few rebellions against the government and the Jewish people there sided with the revolutionary elements. That was the end of the writing and complying of the Talmud. Also I must add that there is a level of thinking and depth in the Talmud which you just do not see after that. The hundred years after the closing there were still some sages that did the finishing touches and transmission. Then the yeshivot were allowed to be opened by the Muslims that had taken over the area. That was the beginning of the period of the Geonim.