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Singular Term/Tugendhat: we need it because we cannot imagine object, but we mean them - VsRepresentation - instead: propositional content.
Singular Term/Tugendhat: difference to predicate: we cannot say analogously, the singular term 'a' stands for those object that if the predicate 'F' applies to it, the assertion 'Fa' becomes true.
Then the object "a" would be the indistinguishable of all other objects to which the predicate 'F' also applies -Singular term form equivalence classes.
Singular Term/Tugendhat: can stand for 4 types of objects: 1. demonstrative expressions: "this mountain" - 2. description with location - 3. other clear relation E.g. "the murderer of Schmidt" (not perception but relative feature) - 4. by a single characteristic: E.g. "the highest mountain".
Vorlesungen zur Einführung in die Sprachanalytische Philosophie Frankfurt 1976
Philosophische Aufsätze Frankfurt 1992