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The partial differential equation u_t=u_(xxxxx)+5/2u_(xxx)u+(25)/4u_(xx)u_x+5/4u^2u_x.

Given a positive integer n, a labeled n-digraph is a digraph whose vertex set is {1,...,n}.

A function that has a natural boundary.

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

If xsinalpha=sin(2beta-alpha), then (1+x)int_0^alpha(dphi)/(sqrt(1-x^2sin^2phi))=2int_0^beta(dphi)/(sqrt(1-(4x)/((1+x)^2)sin^2phi)).

A submodule L of a module M such that for any other nonzero submodule K of M, the intersection L intersection K is not the zero module. L is also called an essential ...

A generalization of the concept of set unions and intersections.

A lattice embedding is a one-to-one lattice homomorphism.

The least common denominator of a collection of fractions (p_1)/(q_1),...,(p_n)/(q_n) is the least common multiple LCM(q_1,...,q_n) of their denominators.

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