# Economics Dictionary of Arguments

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Intensional Logic: intensional logic is a logic that goes beyond the examination of the possibilities of linking fixed (extensional) statements. Problems occur in the context of meaning shifts of intensions (statements that are relativized to speakers and situations). A central problem is the impossibility of quantifying into intensional contexts, that is, e.g. to conclude from a dream the existence of the dreamed content. The treatment of possibility and necessity also belongs to the intensional logic. See also modal logic, possible worlds, semantics of possible worlds, intensions, propositions, opacity, possibility, necessity.
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Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments.

Author Concept Summary/Quotes Sources

Jaakko Hintikka on Intensional Logic - Dictionary of Arguments

II 11
Intensional Logic/non-standard/Hintikka: intensional logic uses non-standard semantics (i.e. the individual domain is not fixed). Therefore, it is not necessary to limit the domain of possible worlds of their framework. It would also be inappropriate for other reasons:
In the epistemic logic the restriction would mean that everyone knows the identity of all individuals in the possible world. This would lead to omniscience.
Also:
Problem: this would make the situation even stranger: there must then often be epistemic alternatives to the world w0, which are not alethic (logical) alternatives! This contradicts the natural assumption that logical possibility forms the broadest class of possibilities.
>Epistemic logic
, >Modal logic, >Domains, >Possible worlds.

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Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution. Translations: Dictionary of Arguments
The note [Concept/Author], [Author1]Vs[Author2] or [Author]Vs[term] resp. "problem:"/"solution:", "old:"/"new:" and "thesis:" is an addition from the Dictionary of Arguments. If a German edition is specified, the page numbers refer to this edition.

Hintikka I
Jaakko Hintikka
Merrill B. Hintikka
Investigating Wittgenstein
German Edition:
Untersuchungen zu Wittgenstein Frankfurt 1996

Hintikka II
Jaakko Hintikka
Merrill B. Hintikka
The Logic of Epistemology and the Epistemology of Logic Dordrecht 1989

> Counter arguments against Hintikka
> Counter arguments in relation to Intensional Logic