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A Fourier series in which there are large gaps between nonzero terms a_n or b_n.

A function that has a natural boundary.

A lag system, introduced by Wang (1963), is a sort of opposite to a tag system. Lag systems allow dependence on more than just the first element, but remove only the first ...

The second-order ordinary differential equation y^('')+k/xy^'+epsilony^'y=0.

A quantity involving primitive cube roots of unity which can be used to solve the cubic equation.

Coefficients which appear in Lagrange interpolating polynomials where the points are equally spaced along the abscissa.

The Lambert cylindrical equal-area projection is a cylindrical equal-area projection with standard parallel phi_s=0 degrees.

There are two curves commonly known as the Lamé curve: the ellipse evolute and the superellipse.

Whittaker and Watson (1990, pp. 539-540) write Lamé's differential equation for ellipsoidal harmonics of the first kind of the four types as ...

A two-dimensional planar closed surface L which has a mass M and a surface density sigma(x,y) (in units of mass per areas squared) such that M=int_Lsigma(x,y)dxdy. The center ...