Implications

This non-implication, Form 137-k \( \not \Rightarrow \) Form 149, whose code is 4, is constructed around a proven non-implication as follows:

  • An (optional) implication of code 1 or code 2 is given. In this case, it's Code 2: 1515, whose string of implications is:
    345 \(\Rightarrow\) 14 \(\Rightarrow\) 139 \(\Rightarrow\) 137-k
  • A proven non-implication whose code is 3. In this case, it's Code 3: 1061, Form 345 \( \not \Rightarrow \) Form 144 whose summary information is:
    Hypothesis Statement
    Form 345 <p> <strong>Rasiowa-Sikorski Axiom:</strong>  If \((B,\land,\lor)\) is a Boolean algebra, \(a\) is a non-zero element of \(B\), and \(\{X_n: n\in\omega\}\) is a denumerable set of subsets of \(B\) then there is a maximal filter \(F\) of \(B\) such that \(a\in F\) and for each \(n\in\omega\), if \(X_n\subseteq F\) and \(\bigwedge X_n\) exists then \(\bigwedge X_n \in F\). </p>

    Conclusion Statement
    Form 144 <p> Every set is almost well orderable. </p>

  • An (optional) implication of code 1 or code 2 is given. In this case, it's Code 2: 5153, whose string of implications is:
    149 \(\Rightarrow\) 67 \(\Rightarrow\) 144

The conclusion Form 137-k \( \not \Rightarrow \) Form 149 then follows.

Finally, the
List of models where hypothesis is true and the conclusion is false:

Name Statement
\(\cal M40(\kappa)\) Pincus' Model IV The ground model \(\cal M\), is a model of \(ZF +\) the class form of \(AC\)
\(\cal N40\) Howard/Rubin Model II A variation of \(\cal N38\)

Edit | Back