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There is a machlokes Rishonim whether emunah in Hashem is a mitzvah or not. The Rambam and Ramban sayig that it is. The Bahag (a Gaon), R' Kreskas, Tashbetz and others saying that it's not or that it can't be. What nafkah minah comes out of this machlokes?

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Gabi: If you would put in the source location - perhaps it would be easier to get a response. –  Gershon Gold Jan 9 '13 at 19:57
related judaism.stackexchange.com/q/13872/759 –  Double AA Jan 24 '13 at 3:27

3 Answers 3

One practical difference is whether there is another mitzvah to take its place in order to have 613. According the the opinion that it is not a mitzvah, there must be another mitzvah that is Biblical.

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Perhaps the other mitzva was still Biblical but counted together with something else? You have no proof that there has to be mitzva that must now be Biblical. –  Double AA Jan 21 '13 at 21:26
After "what if I mekadesh a woman all tenai that pshat X is right" and "must I klop an all cheit", i think this is now the third most unimpressive possible Nafka Mina. –  Double AA Jan 21 '13 at 21:29
@DoubleAA: you're right. The basis of the machloket is whether one can command belief, since in order to accept the commandment, you must already believe. But that's not a nafka mina as much as a reason for the disagreement –  Menachem Jan 22 '13 at 15:43
So what is a nafkah mina? Whether or not believing is a Biblical requirement doesn't show if anything else is or isn't. –  Double AA Jan 22 '13 at 17:04

Maybe a nafka mina can be whether emuna is axiomatic-and you will have to come to it if you're honest, or its a mitzvah and therefore maybe in some way harder to achieve?

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This is really a more general question about minyan hamitzvos--what is the nafka minah ever? It is well-known that the Gra objected to the enterprise of minyan hamitzvos on similar grounds. Various acharonim propose various explanations (see: hakdamah of Kiryas Sefer of the Mabit, hakdamah of R. Yerucham Perlow to Sefer Hamitzvos le-Rasag) but I don't think they would help here. In the end of the day, it might just be to know what the Taryag mitzvos are.

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