|Abstraction: Subsumption of objects by non-consideration of certain properties. See also equivalence relation, concretion, concreta, indiscernibility.|
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|Berka I 498
Abstraction Principle / Carnap / Tarski: with it all the expressions of the language can be divided in classes with no common elements - two expressions belong only to the same class if they belong to the same semantic category (meaning category) - each such class, is simply a m.c.
Logic, Semantics, Metamathematics: Papers from 1923-38 Indianapolis 1983
K. Berka/L. Kreiser
Logik Texte Berlin 1983