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Kunstformen der Natur (1904) by Ernst Haeckel
Kunstformen der Natur (1904) by Ernst Haeckel

"Apodictic" or "apodeictic" (Template:Lang-grc, "capable of demonstration") is an adjectival expression from Aristotelean logic that refers to propositions that are demonstrable, that are necessarily or self-evidently the case or that, conversely, are impossible. Apodicticity or apodixis is the corresponding abstract noun, referring to logical certainty.

Apodictic propositions contrast with assertoric propositions, which merely assert that something is (or is not) the case, and with problematic propositions, which assert only the possibility of something being true. Apodictic judgments are clearly provable and logically certain. For instance, "Two plus two equals four" is apodictic. "Chicago is larger than Omaha" is assertoric. "A corporation could be wealthier than a country" is problematic. In Aristotelian logic, "apodictic" is opposed to "dialectic," as scientific proof is opposed to philosophical reasoning. Kant contrasts "apodictic" with "problematic" and "assertoric" in the Critique of Pure Reason, on page A70/B95.

The expression "apodictic" is also sometimes applied to a style of argumentation in which a person presents his reasoning as being categorically true, even if it is not necessarily so.

Apodictic a priorism

Hans Reichenbach, one of the founders of logical positivism, offered a modified version of Immanuel Kant's a priorism by distinguishing between apodictic a priorism and constitutive a priorism.

Unless indicated otherwise, the text in this article is either based on Wikipedia article "Apodicticity" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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