@misc{Lexicon of Arguments,
title = {Quotation from: Lexicon of Arguments – Concepts - Ed. Martin Schulz, 28 Mar 2024},
author = {Stechow,Arnim von},
subject = {Extensionality},
note = {61
Extensional propositional logic/Stechow: cannot describe the meaning of "Modals".
>Modality, >Modal Logic, >Meaning, >Extension, >Extensionality.
E.g. the meaning of "must" is "follows from my knowledge".
[[must f]] says in epistemic meaning that [[f]] is a superset of my knowledge.
The meaning function [[must]] is a relation between two sets of situations.
>Functions, >Situations.
Such meanings (sets of possible worlds) we do not have when sentences (extensionally) designate truth values.
>Truth values, >Possible worlds, >Intensions.},