I 220
Use/mention/Wessel: the statement "a and b are identical" is not about the terms "a" and "b", but about the objects they designate - that is, the terms "a" and "b" are used and not mentioned - (s) if the terms were mentioned, one would talk about the terms and not about the objects.
>
Mention/use, >
Use, >
Levels/order, >
Metalanguage, >
Object language.
I 286
Use/mention: logical follow-up relationship: A I- B: talks about statements (i.e. not content).
>
Consequence.
Conditional: A -> B: talking about the content which is talked about in the statements (e.g. current, magnetic field).
((s)Question/(s): mention is = if it is not talked about statements content-related?
Use: = if e.g. the truth is found? - But: "A is true" - does not mean "the current flows".)
I 313
((s) Use/mention/Wessel/(s): E.g. "The Inselsberg is referred to by the term Inselsberg":
1. incident used as a term, and designates the object,
2. the word is not used here as a term, but mentioned as a physical object
Inselsberg: is mentioned - name: is used.
Mention: = quote (quotes).
Instead of quotation marks: t: t A: name of statement A - "the statement A".
I 352
Incident/mention/use/Wessel:
1. Term or statement A occurs as a term or statement in: E.g. ~ A or A and B.
2. merely as a physical thing (darkness, sound) in E.g. "the statement A" (tA), or "the facts that A" (sA) - E.g. from "Ließchen says a" (only graphically A) and A ↔ B does not follow "Ließchen says B" - therefore it always needs to be defined what must be regarded as incident of a term.
(s) A sound cannot be true or false.
ad I 352
((s) Mention/use/density/Wessel/(s): different density of the pages: just plays no role in 2 + 2 = 4.)
I 35
"Odd"/Frege: occurrence as merely graphical part.
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Odd sense, >
Odd meaning, >
Fregean sense, >
Fregean meaning, >G. Frege.
Extensionality rule: statements can be replaced by identical ones in meaning, but not any graphical parts.
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Extensionality, >
Extensions.
Wessel: the extensionality rule is here not applicable. - Because intensional rules are very similar to extensional ones, but sometimes replacing of graphical parts by genuine statements.
I 353
Planets example /Wessel: Quine does not differentiate between graphic and genuine occurrence. Only identity sentences: evening star = morning star, number of planets = 9 and then substitutability for identities.
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Substitution, >
Substitutability, >
Identity, >
Morning star/evening star, >
Planets example.
WesselVsQuine: See them as compound expressions: then evening star unequal morning star, as simple equal (for Venus).