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Full Idea
The concept of number is simply what is common to all numbers, the general form of number. The concept of number is the variable number.
Gist of Idea
The concept of number is just what all numbers have in common
Source
Ludwig Wittgenstein (Tractatus Logico-Philosophicus [1921], 6.022)
Book Ref
Wittgenstein,Ludwig: 'Tractatus Logico-Philosophicus (Pears)', ed/tr. Pears,D. /McGuinness,B. [RKP 1961], p.59