[Avodah] halachic derivation rules

[Joel Rich]

A number of times when the Talmud is ping-ponging back-and-forth trying to
determine the underlying reason for a difference of opinion, it will state
that one of the parties learned a din from a particular textual source,
which the other party did not (lo mishma lei)



These seem to come in a number of different flavors such as a possible
extra letter (e.g. megillah 17b dvarim/hadvarim) or an extra word (eg bava
metzia 27b mimenu).

I was thinking that in other circumstances where such a letter or word
appeared, there is no debate, and the derivation is accepted by all.



I was wondering if anybody had seen anything which indicated that a
particular rabbi tended to (or not to) use such a source  as a general rule
and/or is it possible that the decision as to whether to use or not you
such a rule was dependent on what that Rabbi already believed was the
pre-existing halacha  that needed to be obtained?

KT
Joel Rich
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