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When someone claims a lost object as theirs (bori), why aren't they defeated by the statistical likelihood (rov) that it belongs to someone else? The shiur develops the principle that rov only works when there's a defined group the object could come from, not when only one specific person lost it.
The shiur analyzes a fundamental question in the laws of lost objects: when someone finds an object and another person claims it's theirs with certainty (bori), why isn't that claim defeated by the statistical probability (rov) that it belongs to someone else in the world? The Gemara (גמרא) establishes that when someone says 'bori' (I am certain) versus 'shema' (perhaps), normally the bori wins, but this seems to contradict the principle of rov. Rabbi Zweig develops a crucial distinction in how rov functions. In classic cases like nine kosher stores and one non-kosher store, rov works because there's a defined group - any of the nine kosher stores could have produced the meat in question. The probability calculation works because we're comparing discrete groups where the object could realistically come from multiple sources within the larger group.
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Kesubos 12b
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