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The Gemara says (Nidah 19b, among other places), אין אדם דן גזירה שווה מעצמו - a person can't make up gezaira shavos, they have to have been learned from one's teacher. If so, how can there ever be a dispute regarding them?

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I'm too lazy to look it up now, but answers to this question are found in the אנציקלופדיה תלמודית – Matt Jul 1 '14 at 23:52
hat exactly do you mean a "dispute"? From what I recall, disputes regarding them are usually resolved by saying that X didn't have that particular G"S in his learned list of accepted ones taught by his teacher while Y did have that one. – Danno Jul 2 '14 at 1:18
@Danno shas is full of actual arguments in gezaira shavas. One example is bava kamma 6b – Matt Jul 2 '14 at 1:28

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