[Avodah] kal vechomer

[Eli Turkel]

<<I am actually happier with the possibility that QvC isn't standard logic.
It is listed among middos shehatorah nidreshes bahen, and rules of
logic that were well known in Chazal's day -- such as Aristotle's study
of syllogisms -- are not. The question of why QvC is derashah and not
sevara has bothered me.

And if so, then asking what justifies QvC is like asking what justifies
kelal uperat -- the Author told us the system works that way. It's not
a priori logic, it's a posited rule of the system.>>

However, the gemara does learn halachot from logic. The most famous being
not killing someone to save one's life because who knows that your blood
is redder than him.

On the second question does the gemara learn anywhere the 13 rules of R.
Yishmael
(or other opinions) or is this all halacha le-moshe mi-sinai (machloket in
that?)

kol tuv


-- 
Eli Turkel
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