Implications

This non-implication, Form 280 \( \not \Rightarrow \) Form 184, 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: 10287, whose string of implications is:
    142 \(\Rightarrow\) 280
  • A proven non-implication whose code is 3. In this case, it's Code 3: 239, Form 142 \( \not \Rightarrow \) Form 93 whose summary information is:
    Hypothesis Statement
    Form 142 <p> \(\neg  PB\):  There is a set of reals without the property of Baire.  <a href="/books/8">Jech [1973b]</a>, p. 7. </p>

    Conclusion Statement
    Form 93 <p> There is a non-measurable subset of \({\Bbb R}\). </p>

  • An (optional) implication of code 1 or code 2 is given. In this case, it's Code 2: 9797, whose string of implications is:
    184 \(\Rightarrow\) 93

The conclusion Form 280 \( \not \Rightarrow \) Form 184 then follows.

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

Name Statement
\(\cal M38\) Shelah's Model II In a model of \(ZFC +\) "\(\kappa\) is a strongly inaccessible cardinal", Shelah uses Levy's method of collapsing cardinals to collapse \(\kappa\) to \(\aleph_1\) similarly to <a href="/articles/Solovay-1970">Solovay [1970]</a>

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