“When will I ever need to know this?” is the universal question when confronted with the distributive law of multiplication over addition.“What does this matter?” is the unavoidable reaction when ...
REFERRING to the review of Hilbert's “Grundlagen der Geometric,” on p. 394 of No. 2066 of NATURE (June 3), may I point out that the commutative law of addition can be proved without the help of any ...
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