The concept of exchangeable random variables is commonplace but the terminology might seem new.
An exchangeable sequence of random variables is one in which any re-ordering of any finite sequence results in the same joint probability function.
An alternative phrasing of this is the joint distribution is invariant to finite permutation.
The term exchangeable was a neologism at the time of its inception in the 1920s in a book on Logic written by an alumnus of Kings College, Cambridge, where said coiner of said term studied mathematics.
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