Implications

This non-implication, Form 89 \( \not \Rightarrow \) Form 188, whose code is 6, is constructed around a proven non-implication as follows:

  • This non-implication was constructed without the use of this first code 2/1 implication.
  • A proven non-implication whose code is 5. In this case, it's Code 3: 187, Form 89 \( \not \Rightarrow \) Form 390 whose summary information is:
    Hypothesis Statement
    Form 89 <p> <strong>Antichain Principle:</strong>  Every partially ordered set has a maximal antichain. <a href="/books/8">Jech [1973b]</a>, p 133. </p>

    Conclusion Statement
    Form 390 <p> Every infinite set can be partitioned either into two infinite sets or infinitely many sets, each of which has at least two elements. <a href="/excerpts/Ash-1981-1">Ash [1983]</a>. </p>

  • An (optional) implication of code 1 or code 2 is given. In this case, it's Code 2: 7297, whose string of implications is:
    188 \(\Rightarrow\) 106 \(\Rightarrow\) 126 \(\Rightarrow\) 82 \(\Rightarrow\) 83 \(\Rightarrow\) 64 \(\Rightarrow\) 390

The conclusion Form 89 \( \not \Rightarrow \) Form 188 then follows.

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

Name Statement
\(\cal N1\) The Basic Fraenkel Model The set of atoms, \(A\) is denumerable; \(\cal G\) is the group of all permutations on \(A\); and \(S\) isthe set of all finite subsets of \(A\)

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