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A second-order ordinary differential equation of the form

The dimension of a special series can never exceed half its order.

A method for constructing magic squares of singly even order n>=6.

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

A method for constructing magic squares of odd order.

The straight polyomino of order n is the n-polyomino in which all squares are placed along a line.

The second-order ordinary differential equation y^('')=y^(3/2)x^(-1/2).

A graphoid consists of a set M of elements together with two collections C and D of nonempty subsets of M, called circuits and cocircuits respectively, such that 1. For any C ...

In a set X equipped with a binary operation · called a product, the multiplicative identity is an element e such that e·x=x·e=x for all x in X. It can be, for example, the ...

An orthogonal coordinate system is a system of curvilinear coordinates in which each family of surfaces intersects the others at right angles. Orthogonal coordinates ...