Unformatted text preview: wellfounded. Even though a member such as (4, 3) has infinitely many other elements below it (for example, (3, y) for every y), any decreasing chain must be finite. Hence, the Ack program always gives an answer. 48 ...
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 Spring '09
 Koskesh
 Math, Set Theory, Georg Cantor, Ack program

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