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Modus Fresison

Form of a syllogism based on the Modus Ferio, in which a negative existential proposition is inferred from negative universal and affirmative existential premisses.

No P is M.
Some M are S.
Therefore, Some S are not P.

For example:

No circle is a rectangle.
Some rectangles are squares.
Therefore, Some squares are not circles.

Modus Fresison is very similar to Modus Ferio, the only difference is that in both premisses the terms are swapped.


The name “Fresison” is a mnemonic term that helps to remember the most important characteristics of this mode: The “F” at the beginning indicates that it is related to the Modus Ferio, while the vowels indicate the types of statements used in the form: “e” stands for a negative universal, the “i” for an affirmative existential premise, while the “o” indicates an affirmative existential conclusion.

See also

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