Implications

We have the following indirect implication of form equivalence classes:

4 \(\Rightarrow\) 404
given by the following sequence of implications, with a reference to its direct proof:

Implication Reference
4 \(\Rightarrow\) 9 clear
9 \(\Rightarrow\) 404 clear

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

Howard-Rubin Number Statement
4:

Every infinite set is the union of some disjoint family of denumerable subsets. (Denumerable means \(\cong \aleph_0\).)

9:

Finite \(\Leftrightarrow\) Dedekind finite: \(W_{\aleph_{0}}\) Jech [1973b]: \(E(I,IV)\) Howard/Yorke [1989]): Every Dedekind finite set is finite.

404:

Every infinite set can be partitioned into infinitely many sets, each of which has at least two elements. Ash [1983].

Comment:

Back