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If X and Y are independent variates and X+Y is a normal distribution, then both X and Y must have normal distributions. This was proved by Cramér in 1936.

A group of sociable numbers of order 3.

A linear functional on a smooth differential form.

z^p-y^p=(z-y)(z-zetay)...(z-zeta^(p-1)y), where zeta=e^(2pii/p) (a de Moivre number) and p is a prime.

A number of the form a_0+a_1zeta+...+a_(p-1)zeta^(p-1), where zeta=e^(2pii/p) is a de Moivre number and p is a prime number. Unique factorizations of cyclotomic integers fail ...

A three-dimensional data set consisting of stacked two-dimensional data slices as a function of a third coordinate.

A power of 10.

In the American system, 10^(33).

A sequence {a_1,a_2,...} for which a_1>=a_2>=....

A series s_1,s_2,... for which s_1>=s_2>=....