End extensions, cofinal extensions
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Revision as of 11:00, 18 January 2013 by Rkossak (Talk | contribs) (Created page with " == Isolated gaps == For $a\in M\models PA$, the gap of $a$, ${\rm gap}(a)$ is $\bigcap\{K_prec_{end} M: a\in K\land \}\setminus \bugcup\{K_prec_{end} M: a\notin K\}$.")
Isolated gaps
For $a\in M\models PA$, the gap of $a$, ${\rm gap}(a)$ is $\bigcap\{K_prec_{end} M: a\in K\land \}\setminus \bugcup\{K_prec_{end} M: a\notin K\}$.
