HeavisideTheta[x] represents the Heaviside theta function \[Theta](x), equal to 0 for x < 0 and 1 for x > 0. HeavisideTheta[x_1, x_2, ...] represents the multidimensional ...

Limit[expr,x->x_0] tells you what the value of expr is when x tends to x_0. When this value is infinite, it is often useful instead to know the residue of expr when x equals ...

NestList[f, expr, n] gives a list of the results of applying f to expr 0 through n times.

TransferFunctionPoles[tf] gives a matrix of roots of the denominators in the TransferFunctionModel object tf.

Mathematica 7 extends its general treatment of lists and matrices by adding a variety of convenient functions, including support for common convolution and structure matrices.

BesselI[n, z] gives the modified Bessel function of the first kind I_n (z).

BesselY[n, z] gives the Bessel function of the second kind Y_n (z).

The Mathematica system provides a convenient way to call functions in external C and other programs. With a .tm template specifying Mathematica functions corresponding to ...

TraditionalFunctionNotation is an option for selections that specifies whether input of the form f(x) is interpreted by the kernel as a function or as a product.

MathieuSPrime[a, q, z] gives the derivative with respect to z of the odd Mathieu function with characteristic value a and parameter q.