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Bemerkungen über die Grundlagen der Mathematik
by Ludwig Wittgenstein
1. We use the expression: "The steps are determined by the formula. . .".
1956
17 ed.
The Enjoyment of Mathematics
by Hans Rademacher, Otto Toeplitz
6 is equal to 2 times 3, but 7 cannot be similarly written as a product of factors.
1930
26 ed.