Definition:Particular Affirmative

Definition
A particular affirmative is a categorical statement of the form:
 * Some $S$ is $P$

where $S$ and $P$ are predicates.

In the language of predicate logic, this can be expressed as:


 * $\exists x: S \left({x}\right) \land P \left({x}\right)$

Its meaning can be amplified in natural language as:
 * There exists at least one object with the property of being $S$ which also has the quality of being $P$.

Also denoted as
Traditional logic abbreviated the particular affirmative as $\mathbf I$.

Thus, when examining the categorical syllogism, the particular affirmative $\exists x: S \left({x}\right) \land P \left({x}\right)$ is often abbreviated:
 * $\mathbf I \left({S, P}\right)$

Linguistic Note
$\mathbf I$ originates from the second vowel in the Latin word affIrmo, meaning I affirm.

Also see

 * Definition:Square of Opposition


 * Definition:Universal Affirmative
 * Definition:Universal Negative
 * Definition:Particular Negative


 * Equivalence of Definitions of Particular Affirmative