But just like the commutative property that we learned last week, the associative property, boys and girls, is a piece of cake, okay? Maybe some chocolate cake with some, what kind of frosting?

NEITHER Dr. Hilbert nor the reviewer make any suggestion that the commutative law of addition is best proved as a deduction from the laws of multiplication. But the laws of multiplication are so ...

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 ...