Quote: the difference between a class and its definition is that a class has many defining characteristics but only one set of members

Quotation

The vital difference between [a class and its defining characteristic] consists in the fact that there is only one class having a given set of members, whereas there are always many different characteristics by which a given class can be defined. ... [p. 14] It is this fact that a defining characteristic is never unique which makes classes useful;   Google-1   Google-2

Published before 1923

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