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How does yiush (despair) combine with shinui ma'aseh (physical change) to effect a kinyan when neither works independently? The shiur analyzes the sugya of kitzur (trimming leather) in Bava Kamma 56b, exploring different levels of shinui ma'aseh and whether shinui hashem (ה׳) (name change) operates differently than physical transformation in creating ownership acquisition.
This shiur presents an intricate analysis of the Gemara (גמרא) in Bava Kamma 56b dealing with the fundamental question of how yiush and shinui ma'aseh combine to create a kinyan when neither mechanism works independently. The central difficulty is understanding how two ineffective elements can combine to produce a halachic effect—a principle that seemingly contradicts basic logic. The Gemara discusses the case of kitzur (trimming leather to make it into a tablecloth or itzvah). The fundamental question is whether kitzur constitutes a shinui ma'aseh sufficient to work together with yiush to effect a kinyan. Tosfos presents a revolutionary reading: he argues that the Mishna's statement that something which is "chasar melacha" (lacking work) cannot become tamei through machshavah alone means that even if one plans to use an item now, if it still requires kitzur, the machshavah cannot be metamei (render it susceptible to tumah). However, if one plans to make kitzur and does make kitzur, the kitzur itself is still not considered a shinui ma'aseh—it doesn't work even together with yiush.
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Bava Kamma 56b
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