ecthesis


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ecthesis

the use of a thesis to state a belief, as the Ecthesis of Heracïius, for-bidding discussion of the duality of Christ’s will.
See also: Religion
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Lameer expounds Farabi's use of ecthesis, which appears in the proofs of Baroco and Bocardo, on the assumption that it operates with term-variables.
But ecthesis in the Arabic logical tradition does not always use term-variables rather than individual-variables.
This is another problem with using the thesis set down to help exposit ecthesis, viz.
As a matter of interest, regardless of how highly Avicenna thinks of Farabi's proof, he considers a different one in Pointers, which works from ecthesis (Pointers, 323-24; his views on conversion cannot be considered here).
The article is an argument that ecthesis should be read as involving individual-variables: see esp.
In the opening chapter on ecthesis, Flannery shows Alexander both offering a nuanced metalogical analysis of the use of "perceptual singulars" in ecthetic proofs of the sort explicitly deployed by Aristotle--for example, in defending the validity of conversion for the universal negative--and constructing alternative "definitional" proofs which, while avoiding resort to perceptual singulars, employ a quasi-ecthetic "hinge" around which the necessary logical manipulations can be effected.