Philosophy Lexicon of Arguments

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Empty set: an empty set is a set without an element. Notation ∅ or {}. There is only one empty set, since without an existing element there is no way to specify a specification of the set. The empty set can be specified as such that each element of the empty set is not identical with itself {x x unequal x}. Since there is no such object, the set must be empty. The empty set is not the number zero, but zero indicates the cardinality of the empty set.
 
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IX 218
Empty set/zero class/Quine: L not equal to 0! (For Frege 0, namely {L}.
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A propos IX 226 ~
Empty set/zero class/(s): unlike definition gap (e.g. divide continuity through zero) - real gap: a well-defined condition is not met, e.g. primes between 31 and 37: 5 natural numbers do not satisfy the condition, 0 natural numbers fulfill the condition - for an infinite number of rational numbers and real numbers the condition is not defined - universal class/(s) if there is nothing that fulfills the condition it is questionable whether we can talk of a set (because it does not match a term) - the other way around: what is should be the condition for the universal class?

Q I
W.V.O. Quine
Wort und Gegenstand Stuttgart 1980

Q II
W.V.O. Quine
Theorien und Dinge Frankfurt 1985

Q III
W.V.O. Quine
Grundzüge der Logik Frankfurt 1978

Q IX
W.V.O. Quine
Mengenlehre und ihre Logik Wiesbaden 1967

Q V
W.V.O. Quine
Die Wurzeln der Referenz Frankfurt 1989

Q VI
W.V.O. Quine
Unterwegs zur Wahrheit Paderborn 1995

Q VII
W.V.O. Quine
From a logical point of view Cambridge, Mass. 1953

Q VIII
W.V.O. Quine
Bezeichnung und Referenz
In
Zur Philosophie der idealen Sprache, J. Sinnreich (Hg), München 1982

Q X
W.V.O. Quine
Philosophie der Logik Bamberg 2005

Q XII
W.V.O. Quine
Ontologische Relativität Frankfurt 2003


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Ed. Martin Schulz, access date 2017-05-30