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* Augustus was the first emperor of the Roman Empire. (''A description of a past state of affairs''.)
* Halley's comet will next appear in the night sky in the year 2062. (''A description of a future event, i.e. a prediction''.)
 
Typically, most propositions produced by both empirical and formal sciences would fall under the category of ''descriptive theory''. Among others, this includes substantive propositions of physics, chemistry, biology, psychology, sociology, and economics, as well those of historical sciences. Excluded from this category are [[Normative Theory|normative propositions]], such as those of methodology, ethics, or aesthetics.
|Resource=Sebastien (2016)
|Prehistory=

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