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What exactly is the principle behind kol kavua k'machtzah al machtzah domi? The shiur develops a fundamental chakira: is it because an object that is kavua (fixed) cannot be determined through rov, or because a rov that is kavua is not considered a true rov? This distinction resolves all three of the Pri Megadim's questions about kavua.
This shiur analyzes a fundamental question in the laws of kavua through the lens of a case discussed in Chachmei Vilna involving seven animals (six kosher, one treif) that were cut in half, with one half taken by a non-Jew. The Gemara (גמרא) in Kesubos 14b provides the foundation for understanding when kol deparish m'ruva parish (whatever separates from a mixture is considered to follow the majority) applies versus when kol kavua k'machtzah al machtzah domi (anything fixed is treated as fifty-fifty) takes precedence. Rabbi Zweig presents a fundamental chakira regarding the principle of kavua. There are two possible explanations for why rov doesn't work by kavua: either because an object that is kavua cannot be determined through rov, or because a rov that is kavua is not considered a genuine rov. The Sma appears to learn like the second approach, arguing that just as chesed (חסד) k'sheim she'ani l'bas (a mother's chazakah helps for her child) works because both mother and child are in the realm of chazakah, so too here, since we have kol deparish m'ruva parish on the half that departed, we can apply that rov to the kavua half remaining.
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Kesubos 14b
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