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A one-sided (singly infinite) Laplace transform, L_t[f(t)](s)=int_0^inftyf(t)e^(-st)dt. This is the most common variety of Laplace transform and it what is usually meant by ...

A one-sided (singly infinite) Z-Transform, Z[{a_n}_(n=0)^infty](z)=sum_(n=0)^infty(a_n)/(z^n). This is the most common variety of Z-transform since it is essentially ...

If a is an element of a field F over the prime field P, then the set of all rational functions of a with coefficients in P is a field derived from P by adjunction of a.

A metric g_(ij) which is zero for i!=j.

A set of statistical distributions having different variances.

A vector field v for which the curl vanishes, del xv=0.

alpha^((m))=1/2gamma_1=(mu_3)/(2sigma^3), where gamma_1 is the skewness.

An algebraic surface of degree 9. Enneper's minimal surface is an example of a nonic surface.

A point at which two polygon edges of a polygon meet.

In the American system, 10^(21).