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Class/logical sum/logical product/list/Properties/Wittgenstein: if a class can be specified by a list, it is a logical product or a sum. - E.g. tones of an octave - then the class is not defined by characteristics, but in the grammar - "tone of an octave" is not a property of a tone - punch line: it is not necessary to add: "and these are all" - that would apply even if the world consisted only of particulars. - By contrast: if a class is defined by properties.
Vorlesungen 1930-35 Frankfurt 1989
Das Blaue Buch - Eine Philosophische Betrachtung Frankfurt 1984
Tractatus Logico Philosophicus Frankfurt/M 1960