Lexicon of Arguments

Philosophical and Scientific Issues in Dispute
 
[german]


Complaints - Corrections

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Concepts
Versus
Sc. Camps
Theses I
Theses II

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I 48
Extensionality: "Law of extensionality": if the sentences S1 and S2 have the same truth value, then, each composite sentence that differs only in that it has S1 as a subset , where the other has S2 as a subset, also the same truth value.
>Truth values, >Truth, >Extensions, >Clauses.
PriorVs: one can count mixed constructions like "__is green and__" also "__believes that__" into the same category as the simple. - If the law of extensionality is true, then must "grass is pink" and "grass is purple" be the same thought.
>Thoughts, >Thought/Frege, cf. >Fregean meaning, >Fregean sense.
Solution: "x thinks, grass is pink" is not a compound sentence with "grass is pink" as a component.
Cf. >Compositionality, >Thinking, >Sentences, >Propositions.
I 50
Extensionality/Prior: Lesniewski/Lukasiewicz: if one drops the E, one must admit that some propositions are neither true nor false.
>St. Lesniewski, >J. Lukasiewicz.
PriorVsExtensionality: truth value of a statement depends not only on its truth value. (Circular).
>Circular reasoning.
I 93
Law of extensionality: propositions with the same truth value are identical.
>Identity, cf. >Equivalence.
I 139
Extensionality/Prior: "cause", "bring about" seems to be the most extensional operator: the one who brings p about, brings everything into existence ipso facto, what is equivalent with p.
Cf. >Command/Prior.
But it does not bring into existence what it contains (entailment, asymmetric implication ): E.g. someone is caught by the FBI and a communist, but that does not bring about, that he is a communist.
>Causation, >Entailment/Prior.

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