Books on Amazon
Property / feature / Frege: something can be both feature and property, but not of the same! - A feature of a term may be property of an object - ((s) features of concepts are essential.) -
Term / Feature / property / object / Frege: object: has properties: - concept: has features: eg, the statement that there is no right-angled equilateral triangle, expresses a feature of the concept. - existence / Frege: not property of things but characteristic (feature) of a term. - FregeVsAnselm: therefore fails the ontological proof of God.
Die Grundlagen der Arithmetik Stuttgart 1987
Funktion, Begriff, Bedeutung Göttingen 1994
Logische Untersuchungen Göttingen 1993