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Modus Camestres

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

All P are M.
No S is M.
Therefore, no S is P.

For example:

All squares are rectangles.
No circle is a rectangle.
Therefore, No circle is a square.

Modus Camestros is similar to Modus Camestros, but is the stronger of the two forms, as it infers a universal statement rather than an existential one.


The name “Camestres” is a mnemonic term that helps to remember the most important characteristics of this mode: The “C” at the beginning indicates that it is related to the Modus Celarent, the “a” indicates the affirmative, the two “e” the negative universal statements that make up the form.

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