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Q: Name of an expression which says that a given argument or proof holds word for word when "X" is replaced by "Y"

Cartesian BearI remember reading once or twice a likely latin expression which says more or less that some argument or proof in mathematics holds word for word when "X" is replaced by "Y". I cannot for the life of me remember what it was nor do I remember where I have seen it. Could you help me with this? An e...


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