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Demarcation Criterion  Schurz  I 14/15 Demarcation criterion/Schurz: in relation to metaphysics. Problem: principles that have no empirical consequences when considered in isolation may have new empirical consequences when considered together with other theoretical propositions. >Metaphysics, >Principles, >Method, >Theoretical terms, >Theory language, >Ontology, >Additional hypotheses. 
Schu I G. Schurz Einführung in die Wissenschaftstheorie Darmstadt 2006 
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Popper, K.  Hempel. Vs Popper, K.  II 111 Def Empiricist Criterion of Meaning/Hempel: (2.1) provisionally: demand for principally complete falsifiability: (instead of verifiability): A statement has an empirical meaning iff. its negation is not analytical and follows logically from a finite logically consistent class of observation statements. (>Popper, demarcation criterion, empirical science Vs mathematics, logic). HempelVs: 1) that excludes pure existence assertions like "There is at least one unicorn", etc. Also mixed statements (existence and allquantification). Because none of these can be falsified conclusively by a finite set of observations. (HempelVsPopper) 2) E.g. a conjunction of a completely falsifiable statement S and a not completely falsifiable statement N is absurdly completely falsifiable. Reason: if the negation of S is the result of a class of observation statements, then the negation of S and N, a fortiori, is the consequence of the same class. E.g. "All swans are white and the absolute is perfect". 3)Observation predicate: the assertion: "All things have the property p" is then significant. 
