Lexicon of Arguments

 

I 126
Necessary/Wessel: often: "~ p > p" interpreted as necessary - Problem: no way to differentiate between "p" and "p is necessary".
>Logical necessity, >Logical possibility.
"Logically impossible": "p> ~ p": then "~ p" and "p is impossible" equivalent.
>Equivalence.
I 344
Necessity/Wessel: when I designate a sentence as needed, I give a hint about my judgment reasons.
>Judgments, >Reasoning, >Justification.
Possibility: Speaker abstains from judgment.
>Possibility, cf. >Score keeping.
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.
>Stronger/weaker, >Strength of theories.
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.
>Provability, >Modalities, >Logical truth.
Logical falsifiability is equivalent to logical falsehood and logical impossibility.
>Contradictions, >Consistency.