1st Source: Workshop of clinical topology #32 A tetravalent logic

The logic of the subject is tetravalent

The standard logic, called Aristotle logic, uses the principle of the excluded third. I.e a proposition is either true or false. However, by a closer look as did Godel, Husserl, Lacan and many others, we see that some cases invalidate this approach by revealing a part of undecidable. The logic must integrate its share of incompleteness. There are propositions that may be true and false, or neither true nor false. These modified logic elements could remain on purely mathematical fields. The analytical listening uncovers that much of the discourse of the analysand enters into this logic of four truths values. We describe this tetravalent logic in its mathematical approach and clinical approach.

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