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When Gemara (גמרא) learns out one category from another through *toldos*, how can it then ask if they're *ki yotzei bo* (similar) or *lo ki yotzei bo* (dissimilar)? The shiur analyzes Bava Kamma 2a alongside the Shabbos (שבת) discussion of *avos* and *toldos*, developing Rashi (רש"י)'s position that a *tolda* has no independent existence in the presence of its *av*, and exploring Tosfos's difficult requirement that one must give *hasra'ah* for the specific *tolda*.
The shiur opens with a fundamental conceptual difficulty in Bava Kamma 2a. The Gemara (גמרא) asks whether the *toldos* (derivative categories) of damage are *ki yotzei bo* (similar to the primary categories) or *lo ki yotzei bo* (dissimilar). Rabbi Zweig points out that this question seems inherently contradictory—if they're learned out from one another through the hermeneutical principle of *binyan av*, how can they possibly be dissimilar? And if they are dissimilar, how can one be learned from the other? The very premise of asking whether something learned through *toldos* is *ki yotzei bo* seems paradoxical. The shiur references the Brisker Rav's approach that when learning from *mah matzinu* (precedent), it's really one principle with details that need to be worked out. The example of *bor* (pit) is discussed—learning certain damages from *bor* doesn't create entirely separate categories but rather extends the principle of *bor* itself. However, the shiur notes this approach works for *mah matzinu* but doesn't fully address the issue of *toldos* in our sugya, where we're learning one thing directly from another.
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Bava Kamma 2a
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