|Concept: term for an entity with certain properties. The properties of an object correspond to the features of the concept. These concept features are necessary in contrast to the properties of an individual object, which are always contingent.|
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Monad/Strawson: simplest form: the concept of an x, that... - but not determined by the relative clause, but the concept of these things- e.g. the concept of a person who has killed a man: Universal, but no monad - because not a complete concept - Strawson: in the real world a complete description is completely meaningless.
Complete Concept/Leibniz/Strawson: classes can be formed from complete descriptions if the descriptions given by the relative clause contain in both cases identical, but differently arranged elements.
Einzelding und logisches Subjekt Stuttgart 1972
Analyse und Metaphysik München 1994
Die Grenzen des Sinns Frankfurt 1981