Ferison

Ferison

Feriso.
See also: Logic
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These deductions are all particular, whether affirmative (see Darapti, Disamis, and Datisi) or privative (see Felapton, Ferison, and Bocardo).
The last deduction of the third figure is Ferison, whose premises are universal and particular: (54)
The proof of the potential inferential necessity pertains to the conversion of the minor premise "some S is R" into "some R is S," such that Ferison (3.6) is reduced to the complete deduction Ferio (1.4) of the first figure:
The incomplete deducibility (or potential, inferential necessity) of Ferison is proved through the complete deducibility (or inferential necessity) of Ferio.