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(Deltau)_i^2=(u_i-u^_)^2, where u^_ is the average of {u_i}.

If the Lexis ratio L<1, a set of trials are said to be subnormal.

One of the 14 4-polyaboloes.

The three 3-polyiamonds are called tetriamonds.

B_(p+k)=B_k+B_(k+1) (mod p), when p is prime and B_n is a Bell number.

One of the four 3-polyaboloes.

The unique 3-polyiamond, illustrated above.

Possessing a three equivalent modes.

If s_x is the standard deviation of a set of samples x_i and x^_ their mean, then the variation coefficient is defined as V=(s_x)/(x^_).

A^n+B^n=sum_(j=0)^(|_n/2_|)(-1)^jn/(n-j)(n-j; j)(AB)^j(A+B)^(n-2j), where |_x_| is the floor function and (n; k) is a binomial coefficient.