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The function defined by y_+^alpha={y^alpha for y>0; 0 for y<=0. (1)

The symbol p^e∥n means, for p a prime, that p^e|n, but p^(e+1)n.

The number of ways in which a group of n with weights sum_(i=1)^(n)w_i=1 can change a losing coalition (one with sumw_i<1/2) to a winning one, or vice versa. It was proposed ...

An algebra in which the associator (x,x,x)=0. The subalgebra generated by one element is associative.

P_y(nu)=lim_(T->infty)2/T|int_(-T/2)^(T/2)[y(t)-y^_]e^(-2piinut)dt|^2, (1) so int_0^inftyP_y(nu)dnu = lim_(T->infty)1/Tint_(-T/2)^(T/2)[y(t)-y^_]^2dt (2) = <(y-y^_)^2> (3) = ...

Hardy and Littlewood (1914) proved that the sequence {frac(x^n)}, where frac(x) is the fractional part, is equidistributed for almost all real numbers x>1 (i.e., the ...

Given a function of the form y=Ax^B, (1) least squares fitting gives the coefficients as b = ...

A power of 10.

A formula for the permanent of a matrix perm(a_(ij))=(-1)^nsum_(s subset= {1,...,n})(-1)^(|s|)product_(i=1)^nsum_(j in s)a_(ij), where the sum is over all subsets of ...

The cube of a graph is defined as its third graph power.