Axiom Of Choice

We have the following indirect implication of form equivalence classes:

36 \(\Rightarrow\) 73 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
36 \(\Rightarrow\) 62	On Loeb and weakly Loeb Hausdorff spaces, Tachtsis, E. 2000, Math. Japon.
62 \(\Rightarrow\) 132	Sequential compactness and the axiom of choice, Brunner, N. 1983b, Notre Dame J. Formal Logic
132 \(\Rightarrow\) 73	clear

Here are the links and statements of the form equivalence classes referenced above:

Howard-Rubin Number	Statement
36:	Compact T\(_2\) spaces are Loeb. (A space is Loeb if the set of non-empty closed sets has a choice function.)
62:	\(C(\infty,< \aleph_{0})\): Every set of non-empty finite sets has a choice function.
132:	\(PC(\infty, <\aleph_0,\infty)\): Every infinite family of finite sets has an infinite subfamily with a choice function.
73:	\(\forall n\in\omega\), \(PC(\infty,n,\infty)\): For every \(n\in\omega\), if \(C\) is an infinite family of \(n\) element sets, then \(C\) has an infinite subfamily with a choice function. De la Cruz/Di Prisco [1998b]

Comment:

Back