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Modus Disamis

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

Some M are P.
All M are S.

Some S are P.

For example:

Some rectangles are squares.
All rectangles are polygons.

Some polygons are squares.

Modus Disamis is very similar to Modus Darii, except that the term in the minor statement are reversed.

Name

The name “Disamis” is a mnemonic term that helps to remember the most important characteristics of this mode: The “D” at the beginning indicates that it is related to the Modus Darii, the “a” and the two “i” indicate the affirmative universal and existential statements that make up this form.

See also

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Ad Hominem Info is a project to explain and categorize the most common systematic fallacies and fallacies. On this page, you will find a background article that briefly explains an important logical concept, which may be needed to better understand another article in this area.
For more information, please see the main category “logic

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