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One of the symmetry groups of the Platonic solids. There are three polyhedral groups: the tetrahedral group of order 12, the octahedral group of order 24, and the icosahedral ...

A second-order ordinary differential equation of the form

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

A map which is monotone increasing and therefore order-preserving.

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.

An ordinary differential equation of order n is an equation of the form F(x,y,y^',...,y^((n)))=0.

For a partial order, the size of the longest chain is called the length.

For a partial order, the size of the longest antichain is called the width.