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Modus Felapton

Form of a syllogism based on the Modus Ferio, in which a negative existential proposition is inferred from negative universal and affirmative existential premisses. This form has an additional existential requirement.

No M is P.
All M are S.
[and there exists at least one M]*
Therefore, Some S are not P.

For example:

No rectangle is a circle.
Some rectangles are squares.
[and there exists at least one rectangle]*
Therefore, Some squares are not circles.

Modus Felapton is very similar to Modus Ferio, the only difference is that the terms in the minor statement are swapped.


The name “Felapton” 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” and “o” stand for a negative universal and existential, the “i” for an affirmative existential statements.

See also

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