On Retracts of the Random Graph and Their Natural Order
نویسنده
چکیده
We prove that the natural order on the idempotents of the endomorphism monoid of the countably in®nite random graph is d 0-universal; that is, it embeds every countable order. We therefore extend in a strong fashion a result of [2] which showed that the natural order embeds every countable linear order. We consider a re®nement of the natural order which embeds every countable quasi-order.
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تاریخ انتشار 2002