I have no idea whether it's useful for anything, but a threeld is a pair of fields where the multiplication operation on the inner one forms the multiplication on the outer one. The finite ones have inner order 3 and outer order 2, or inner order a Mersenne prime and outer order the adjacent power of two, but there also exist infinite ones with inner field of characteristic 0 and outer of characteristic 2.


@11011110 you probably want to say: "the addition operation on the inner one forms" etc.

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@nobrowser Oops, yes. Too late to delete&redraft, though.

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