Philosophy Lexicon of Arguments

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Necessity, philosophy: different kinds of necessity are distinguished, differing in their strength. For example, physical, logical or metaphysical necessity. See also necessity de dicto, necessity de re.

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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.

 
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I 126
Necessary/Wessel: often: "~ p > p" interpreted as necessary - Problem: no way to differentiate between "p" and "p is necessary" - "logically impossible": "p> ~ p": then "~ p" and "p is impossible" equivalent.
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I 344
Necessity/Wessel: when I designate a sentence as needed, I give a hint about my judgment reasons - possibility: Speaker abstains from judgment.
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I 350
Logical/physically necessary/Wessel: 1. what is logically necessary is also factually necessary - 2. What is factually possible is also logically possible - 3. What is factually not necessary, is also not logically necessary - 4. what is logically impossible , is also factually impossible - logical modality sets limits on the factual modality - because logical modality alone from linguistic requirements, not ontologically - logical truth is equivalent to logical demonstrability and logical necessity - logical falsifiability is equivalent to logical falsehood and logical impossibility.


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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.

We I
H. Wessel
Logik Berlin 1999


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Ed. Martin Schulz, access date 2017-10-22