Implications

This non-implication, Form 216 \( \not \Rightarrow \) Form 391, 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: 10311, whose string of implications is:
    217 \(\Rightarrow\) 216
  • A proven non-implication whose code is 3. In this case, it's Code 3: 1452, Form 217 \( \not \Rightarrow \) Form 390 whose summary information is:
    Hypothesis Statement
    Form 217 <p> Every infinite partially ordered set has either an infinite chain or an infinite antichain. </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: 9466, whose string of implications is:
    391 \(\Rightarrow\) 399 \(\Rightarrow\) 323 \(\Rightarrow\) 62 \(\Rightarrow\) 61 \(\Rightarrow\) 11 \(\Rightarrow\) 12 \(\Rightarrow\) 336-n \(\Rightarrow\) 64 \(\Rightarrow\) 390

The conclusion Form 216 \( \not \Rightarrow \) Form 391 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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