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The Labs septic is a septic surface having 99 ordinary double points, which is the maximum number known for any septic surface.

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

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 ...

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

An algorithm for computing the eigenvalues and eigenvectors for large symmetric sparse matrices.

(theta_3(z,t)theta_4(z,t))/(theta_4(2z,2t))=(theta_3(0,t)theta_4(0,t))/(theta_4(0,2t))=(theta_2(z,t)theta_1(z,t))/(theta_1(2z,2t)), where theta_i are Jacobi theta functions. ...

The statistical index P_L=(sump_nq_0)/(sump_0q_0), where p_n is the price per unit in period n and q_0 is the quantity produced in the initial period.

A generalization of the concept of set unions and intersections.

A point at the intersection of two or more grid lines in a point lattice.

The Lebesgue identity is the algebraic identity (Nagell 1951, pp. 194-195).