"Concepts have meaning only if we can point to objects to which they refer and to rules by which they are assigned to these objects."
— Concept

January 1, 1970

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Added on April 10, 2026
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Original Language: English

Sources

Albert Einstein, "Ernst Mach," Physikalische Zeitschrift, 17 (1916) as quoted by Peter C. Aichelburg, Roman U. Sexl, Albert Einstein: His Influence on Physics, Philosophy and Politics (2012) p. 117.