Just to be a little more clear about the issues I raised in my blog from yesterday I want to explain a little as best I can.
The idea of R. Meier is this. You can not derive a plus from a minus, a yes from a no. That means let us says you have a sentence, "If it is raining it must be wet outside." To R. Meier you can not derive "If it is not raining it is dry outside." And this came up in one of my little books on Shas. But I had forgotten this whole issue about R Meir.
This comes up in the Talumd tractate "Nedarim" page 11 side A. and in the book of Rav Shach on the Rambam laws of nedarim vows chapter 1 law 18 [actually 18 through 20].
The problem in the Rambam is in law 18 he says, '"That which I will eat of yours is not secular" and then he is forbidden to eat of anything that belongs to the other person.' That is like the Sages against R Meir.. Then in law 20 he says, "That which I will eat of yours is secular or that which I will not eat of yours is secular and that is allowed to eat from the other fellow,' and that is like R Meir. So everyone wants to answer how can the Rambam decide the law in two contradictory ways? The Radvaz [Rav David ben Zimrah], the Migdal Oz [Rav Shem Tov from Spain], and Rav Elazar Shach and Rav Yoseph Karo each try to answer this question.
I have nothing new to add here except that I can see that I really must have been a real ignoramus (am haaretz) when I was at the Mir, because this exact chapter in Nedarim is what the whole yeshiva was learning in my first six months there and I can see now that I was completely unaware of the issues that ought to be obvious to anyone learning Nedarim--but I missed all these issues.
This comes up in the Talumd tractate "Nedarim" page 11 side A. and in the book of Rav Shach on the Rambam laws of nedarim vows chapter 1 law 18 [actually 18 through 20].
The problem in the Rambam is in law 18 he says, '"That which I will eat of yours is not secular" and then he is forbidden to eat of anything that belongs to the other person.' That is like the Sages against R Meir.. Then in law 20 he says, "That which I will eat of yours is secular or that which I will not eat of yours is secular and that is allowed to eat from the other fellow,' and that is like R Meir. So everyone wants to answer how can the Rambam decide the law in two contradictory ways? The Radvaz [Rav David ben Zimrah], the Migdal Oz [Rav Shem Tov from Spain], and Rav Elazar Shach and Rav Yoseph Karo each try to answer this question.
I have nothing new to add here except that I can see that I really must have been a real ignoramus (am haaretz) when I was at the Mir, because this exact chapter in Nedarim is what the whole yeshiva was learning in my first six months there and I can see now that I was completely unaware of the issues that ought to be obvious to anyone learning Nedarim--but I missed all these issues.
