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

The function K_n(x_0,x)=K_n(x,x_0)^_=K_n(x^_,x^__0) which is useful in the study of many polynomials.

The portion of the complex plane z=x+iy with real part R[z]<0.

The second-order ordinary differential equation y^('')+f(x)y^'+y=0.

A distribution with zero kurtosis excess, i.e., gamma_2=0.

The negative real axis is the portion of the real axis with x<0.

An element B of a ring is nilpotent if there exists a positive integer k for which B^k=0.

An ordinary differential equation of order n is an equation of the form F(x,y,y^',...,y^((n)))=0.

A nonsingular linear map A:R^n->R^n is orientation-reversing if det(A)<0.

A quadratic surface given by the equation x^2+2rz=0.